diff --git a/dist/js/entity/in_memory.d.ts b/dist/js/entity/in_memory.d.ts
index 8c7ef904..44075a26 100644
--- a/dist/js/entity/in_memory.d.ts
+++ b/dist/js/entity/in_memory.d.ts
@@ -1,4 +1,3 @@
-import { AnyObject } from "@mat3ra/esse/dist/js/esse/types";
 import { JSONSchema } from "@mat3ra/esse/dist/js/esse/utils";
 import { BaseInMemoryEntitySchema, EntityReferenceSchema } from "@mat3ra/esse/dist/js/types";
 export declare enum ValidationErrorCode {
@@ -8,7 +7,7 @@ export declare enum ValidationErrorCode {
 }
 interface ErrorDetails {
     error?: object | null;
-    json: AnyObject;
+    json: object;
     schema: JSONSchema;
 }
 export declare class EntityError extends Error {
@@ -19,48 +18,52 @@ export declare class EntityError extends Error {
         details?: ErrorDetails;
     });
 }
-export declare class InMemoryEntity implements BaseInMemoryEntitySchema {
-    static create(config: object): InMemoryEntity;
+type Schema = BaseInMemoryEntitySchema;
+export declare class InMemoryEntity<S extends Schema = Schema> implements Schema {
+    static create<T extends InMemoryEntity<Schema>>(config: Schema): T;
     static _isDeepCloneRequired: boolean;
     static allowJsonSchemaTypesCoercing: boolean;
     static readonly jsonSchema?: JSONSchema;
-    _json: AnyObject;
-    constructor(config?: object | InMemoryEntity);
-    prop<T = undefined>(name: string, defaultValue: T): T;
-    prop<T = undefined>(name: string): T | undefined;
+    _json: S;
+    constructor(config: NoInfer<S>);
+    prop<K extends keyof S>(name: K, defaultValue: S[K]): S[K];
+    prop<K extends keyof S>(name: K): S[K] | undefined;
     /**
      * @summary Return a required prop, throwing an error if it doesn't exist or is undefined/null
      */
-    requiredProp<T>(name: string): T;
+    requiredProp<K extends keyof S>(name: K): S[K];
     /**
      * @summary Set a prop
      */
-    setProp(name: string, value: unknown): void;
+    setProp(name: keyof S, value: S[typeof name]): void;
     /**
      * @summary Remove a prop
      */
-    unsetProp(name: string): void;
+    unsetProp(name: keyof S): void;
     /**
      * Updates internal JSON. Works the same as Mongo's $set operator
      * @see https://www.mongodb.com/docs/manual/reference/operator/update/set/#-set
      */
-    setProps(json?: AnyObject): this;
+    setProps(json?: Partial<S>): this;
     /**
-     * @summary Array of fields to exclude from resulted JSON
+     * @summary Array of fields to exclude from resulted JSON.
+     * JSON.stringify calls `toJSON(key)` with the parent property name (a string).
+     * Only an actual array is treated as an omit list — otherwise stringify would
+     * strip fields whose names match the property key (e.g. systemTeams.owner).
      */
-    toJSON(exclude?: string[]): AnyObject;
-    toJSONSafe(exclude?: string[]): AnyObject;
-    toJSONQuick(exclude?: string[]): AnyObject;
+    toJSON(exclude?: (keyof S)[]): S;
+    toJSONSafe(exclude?: (keyof S)[]): S;
+    toJSONQuick(exclude?: (keyof S)[]): S;
     /**
      * @summary Clone this entity
      */
     clone(extraContext?: object): this;
-    static validateData(data: AnyObject, clean?: boolean, jsonSchema?: import("json-schema").JSONSchema7 | undefined): AnyObject;
+    static validateData(data: object, clean?: boolean, jsonSchema?: import("json-schema").JSONSchema7 | undefined): object;
     /**
      * @summary Validate entity contents against schema
      */
     validate(): void;
-    clean(config: AnyObject): AnyObject;
+    clean(config: S): S;
     isValid(): boolean;
     static get cls(): string;
     get cls(): string;
@@ -71,26 +74,21 @@ export declare class InMemoryEntity implements BaseInMemoryEntitySchema {
      * @returns identifying data
      */
     getAsEntityReference(byIdOnly: true): {
+        _id: NonNullable<S["_id"]>;
+    };
+    getAsEntityReference(byIdOnly?: false): EntityReferenceSchema & {
         _id: string;
+        cls: string;
     };
-    getAsEntityReference(byIdOnly?: false): Required<EntityReferenceSchema>;
-    /**
-     * @summary Pluck an entity from a collection by name.
-     *          If no name is provided and no entity has prop isDefault, return the first entity
-     * @param entities the entities
-     * @param entity the kind of entities
-     * @param name the name of the entity to choose
-     */
-    getEntityByName(entities: InMemoryEntity[], entity: string, name: string): InMemoryEntity;
-    get id(): string;
-    set id(id: string);
-    get _id(): string;
-    set _id(id: string);
-    get schemaVersion(): string;
-    set schemaVersion(schemaVersion: string);
-    get systemName(): string;
-    set systemName(systemName: string);
-    get slug(): string;
+    get id(): S["_id"];
+    set id(id: S["_id"]);
+    get _id(): S["_id"];
+    set _id(id: S["_id"]);
+    get schemaVersion(): S["schemaVersion"];
+    set schemaVersion(schemaVersion: S["schemaVersion"]);
+    get systemName(): S["systemName"];
+    set systemName(systemName: S["systemName"]);
+    get slug(): S["slug"] | undefined;
     get isSystemEntity(): boolean;
 }
 export type InMemoryEntityConstructor<T extends InMemoryEntity = InMemoryEntity> = new (...args: any[]) => T;
diff --git a/dist/js/entity/in_memory.js b/dist/js/entity/in_memory.js
index c3540198..ea92daaa 100644
--- a/dist/js/entity/in_memory.js
+++ b/dist/js/entity/in_memory.js
@@ -60,23 +60,18 @@ class InMemoryEntity {
     static create(config) {
         return new this.prototype.constructor(config);
     }
-    constructor(config = {}) {
-        this._json = {};
-        if (config instanceof InMemoryEntity) {
-            this._json = config.toJSON();
-        }
-        else {
-            this._json = this.constructor._isDeepCloneRequired
-                ? (0, clone_1.deepClone)(config)
-                : (0, clone_1.clone)(config);
-        }
+    // NoInfer: keep default S (or an explicit type arg) instead of inferring S from the config literal.
+    constructor(config) {
+        this._json = this.constructor._isDeepCloneRequired
+            ? (0, clone_1.deepClone)(config)
+            : (0, clone_1.clone)(config);
     }
     /**
      * @summary Return a prop or the default
      */
     prop(name, defaultValue) {
         var _a;
-        // `lodash.get` gets `null` when the value is `null`, but we still want a default value in this case, hence `||`
+        // `lodash.get` gets `null` when the value is `null`, but we still want a default value in this case, hence `??`
         return (_a = (0, get_1.default)(this._json, name, defaultValue)) !== null && _a !== void 0 ? _a : defaultValue;
     }
     /**
@@ -114,22 +109,31 @@ class InMemoryEntity {
      * @see https://www.mongodb.com/docs/manual/reference/operator/update/set/#-set
      */
     setProps(json = {}) {
-        Object.entries(json).forEach(([key, value]) => this.setProp(key, value));
+        Object.entries(json).forEach(([key, value]) => {
+            const keyType = key;
+            this.setProp(keyType, value);
+        });
         return this;
     }
     /**
-     * @summary Array of fields to exclude from resulted JSON
+     * @summary Array of fields to exclude from resulted JSON.
+     * JSON.stringify calls `toJSON(key)` with the parent property name (a string).
+     * Only an actual array is treated as an omit list — otherwise stringify would
+     * strip fields whose names match the property key (e.g. systemTeams.owner).
      */
     toJSON(exclude = []) {
+        const omitKeys = Array.isArray(exclude) ? exclude : [];
         return this.constructor._isDeepCloneRequired
-            ? this.toJSONSafe(exclude)
-            : this.toJSONQuick(exclude);
+            ? this.toJSONSafe(omitKeys)
+            : this.toJSONQuick(omitKeys);
     }
     toJSONSafe(exclude = []) {
-        return this.clean((0, clone_1.deepClone)((0, omit_1.default)(this._json, exclude)));
+        const omitKeys = Array.isArray(exclude) ? exclude : [];
+        return this.clean((0, clone_1.deepClone)((0, omit_1.default)(this._json, omitKeys)));
     }
     toJSONQuick(exclude = []) {
-        return this.clean((0, clone_1.clone)((0, omit_1.default)(this._json, exclude)));
+        const omitKeys = Array.isArray(exclude) ? exclude : [];
+        return this.clean((0, clone_1.clone)((0, omit_1.default)(this._json, omitKeys)));
     }
     /**
      * @summary Clone this entity
@@ -206,7 +210,9 @@ class InMemoryEntity {
         return this.constructor.name;
     }
     getAsEntityReference(byIdOnly = false) {
-        if (!this.id) {
+        // Slug is usually present on entity references, but not required for all entities
+        // (e.g. workflows are not slugified). Only `_id` is required to form a reference.
+        if (!this._id) {
             throw new EntityError({
                 code: ValidationErrorCode.ENTITY_REFERENCE_ERROR,
                 details: {
@@ -216,64 +222,41 @@ class InMemoryEntity {
             });
         }
         if (byIdOnly) {
-            return { _id: this.id };
+            return { _id: this._id };
         }
         return {
-            _id: this.id,
-            slug: this.slug,
+            _id: this._id,
+            ...(this.slug !== undefined ? { slug: this.slug } : {}),
             cls: this.getClsName(),
         };
     }
-    /**
-     * @summary Pluck an entity from a collection by name.
-     *          If no name is provided and no entity has prop isDefault, return the first entity
-     * @param entities the entities
-     * @param entity the kind of entities
-     * @param name the name of the entity to choose
-     */
-    // eslint-disable-next-line class-methods-use-this
-    getEntityByName(entities, entity, name) {
-        let filtered;
-        if (!name) {
-            filtered = entities.filter((ent) => ent.prop("isDefault") === true);
-            if (!filtered.length)
-                filtered = [entities[0]];
-        }
-        else {
-            filtered = entities.filter((ent) => ent.prop("name") === name);
-        }
-        if (filtered.length !== 1) {
-            console.log(`found ${filtered.length} entity ${entity} with name ${name} expected 1`);
-        }
-        return filtered[0];
-    }
     // Properties from BaseInMemoryEntitySchema
     get id() {
-        return this.prop("_id", "");
+        return this.prop("_id");
     }
     set id(id) {
         this.setProp("_id", id);
     }
     get _id() {
-        return this.prop("_id", "");
+        return this.prop("_id");
     }
     set _id(id) {
         this.setProp("_id", id);
     }
     get schemaVersion() {
-        return this.prop("schemaVersion", "");
+        return this.prop("schemaVersion");
     }
     set schemaVersion(schemaVersion) {
         this.setProp("schemaVersion", schemaVersion);
     }
     get systemName() {
-        return this.prop("systemName", "");
+        return this.prop("systemName");
     }
     set systemName(systemName) {
         this.setProp("systemName", systemName);
     }
     get slug() {
-        return this.prop("slug", "");
+        return this.prop("slug");
     }
     get isSystemEntity() {
         return Boolean(this.systemName);
diff --git a/dist/js/entity/index.d.ts b/dist/js/entity/index.d.ts
index 0ae8658d..fee5d4c3 100644
--- a/dist/js/entity/index.d.ts
+++ b/dist/js/entity/index.d.ts
@@ -1,8 +1,7 @@
 import { InMemoryEntity } from "./in_memory";
 import { DefaultableInMemoryEntity, HasConsistencyChecksHasMetadataNamedDefaultableInMemoryEntity, HasMetadataNamedDefaultableInMemoryEntity, NamedDefaultableInMemoryEntity, NamedInMemoryEntity } from "./other";
 import { ENTITY_SET_TYPES } from "./set/enums";
-import { constructEntitySetFactoryByConfig } from "./set/factory";
 import { InMemoryEntitySetMixin } from "./set/mixins";
 import { orderedEntityInSetMixin, orderedEntitySetMixin } from "./set/ordered/mixins";
 import * as selectorsForEntitySet from "./set/selectors";
-export { InMemoryEntity, NamedInMemoryEntity, DefaultableInMemoryEntity, NamedDefaultableInMemoryEntity, HasMetadataNamedDefaultableInMemoryEntity, HasConsistencyChecksHasMetadataNamedDefaultableInMemoryEntity, ENTITY_SET_TYPES, constructEntitySetFactoryByConfig, selectorsForEntitySet, InMemoryEntitySetMixin, orderedEntitySetMixin, orderedEntityInSetMixin, };
+export { InMemoryEntity, NamedInMemoryEntity, DefaultableInMemoryEntity, NamedDefaultableInMemoryEntity, HasMetadataNamedDefaultableInMemoryEntity, HasConsistencyChecksHasMetadataNamedDefaultableInMemoryEntity, ENTITY_SET_TYPES, selectorsForEntitySet, InMemoryEntitySetMixin, orderedEntitySetMixin, orderedEntityInSetMixin, };
diff --git a/dist/js/entity/index.js b/dist/js/entity/index.js
index 6f2f0045..1c56aaef 100644
--- a/dist/js/entity/index.js
+++ b/dist/js/entity/index.js
@@ -33,7 +33,7 @@ var __importStar = (this && this.__importStar) || (function () {
     };
 })();
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.orderedEntityInSetMixin = exports.orderedEntitySetMixin = exports.InMemoryEntitySetMixin = exports.selectorsForEntitySet = exports.constructEntitySetFactoryByConfig = exports.ENTITY_SET_TYPES = exports.HasConsistencyChecksHasMetadataNamedDefaultableInMemoryEntity = exports.HasMetadataNamedDefaultableInMemoryEntity = exports.NamedDefaultableInMemoryEntity = exports.DefaultableInMemoryEntity = exports.NamedInMemoryEntity = exports.InMemoryEntity = void 0;
+exports.orderedEntityInSetMixin = exports.orderedEntitySetMixin = exports.InMemoryEntitySetMixin = exports.selectorsForEntitySet = exports.ENTITY_SET_TYPES = exports.HasConsistencyChecksHasMetadataNamedDefaultableInMemoryEntity = exports.HasMetadataNamedDefaultableInMemoryEntity = exports.NamedDefaultableInMemoryEntity = exports.DefaultableInMemoryEntity = exports.NamedInMemoryEntity = exports.InMemoryEntity = void 0;
 const in_memory_1 = require("./in_memory");
 Object.defineProperty(exports, "InMemoryEntity", { enumerable: true, get: function () { return in_memory_1.InMemoryEntity; } });
 const other_1 = require("./other");
@@ -44,8 +44,6 @@ Object.defineProperty(exports, "NamedDefaultableInMemoryEntity", { enumerable: t
 Object.defineProperty(exports, "NamedInMemoryEntity", { enumerable: true, get: function () { return other_1.NamedInMemoryEntity; } });
 const enums_1 = require("./set/enums");
 Object.defineProperty(exports, "ENTITY_SET_TYPES", { enumerable: true, get: function () { return enums_1.ENTITY_SET_TYPES; } });
-const factory_1 = require("./set/factory");
-Object.defineProperty(exports, "constructEntitySetFactoryByConfig", { enumerable: true, get: function () { return factory_1.constructEntitySetFactoryByConfig; } });
 const mixins_1 = require("./set/mixins");
 Object.defineProperty(exports, "InMemoryEntitySetMixin", { enumerable: true, get: function () { return mixins_1.InMemoryEntitySetMixin; } });
 const mixins_2 = require("./set/ordered/mixins");
diff --git a/dist/js/entity/mixins/BankableEntityMixin.d.ts b/dist/js/entity/mixins/BankableEntityMixin.d.ts
new file mode 100644
index 00000000..97b48825
--- /dev/null
+++ b/dist/js/entity/mixins/BankableEntityMixin.d.ts
@@ -0,0 +1,7 @@
+import { type BankableSchemaMixin } from "../../generated/BankableSchemaMixin";
+import type { Constructor } from "../../utils/types";
+import { InMemoryEntity } from "../in_memory";
+import { type HashedEntity } from "./HashedEntityMixin";
+export type BankableEntity = BankableSchemaMixin & HashedEntity;
+export type BankableInMemoryEntityConstructor = Constructor<BankableEntity>;
+export declare function bankableEntityMixin<T extends InMemoryEntity>(item: T): asserts item is T & BankableEntity;
diff --git a/dist/js/entity/mixins/BankableEntityMixin.js b/dist/js/entity/mixins/BankableEntityMixin.js
new file mode 100644
index 00000000..1e31441b
--- /dev/null
+++ b/dist/js/entity/mixins/BankableEntityMixin.js
@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.bankableEntityMixin = bankableEntityMixin;
+const BankableSchemaMixin_1 = require("../../generated/BankableSchemaMixin");
+const HashedEntityMixin_1 = require("./HashedEntityMixin");
+function bankableEntityMixin(item) {
+    (0, BankableSchemaMixin_1.bankableSchemaMixin)(item);
+    (0, HashedEntityMixin_1.hashedEntityMixin)(item);
+}
diff --git a/dist/js/entity/mixins/HasMetadataMixin.d.ts b/dist/js/entity/mixins/HasMetadataMixin.d.ts
index 49273f34..e439a82d 100644
--- a/dist/js/entity/mixins/HasMetadataMixin.d.ts
+++ b/dist/js/entity/mixins/HasMetadataMixin.d.ts
@@ -2,9 +2,11 @@ import type { MetadataSchema } from "@mat3ra/esse/dist/js/types";
 import type { Constructor } from "../../utils/types";
 import { InMemoryEntity } from "../in_memory";
 type Metadata = MetadataSchema["metadata"];
-export type HasMetadata<T extends Metadata = Metadata> = {
-    metadata?: T;
-    updateMetadata: (object: Partial<T>) => void;
+type HasMetadataSchema<M extends Metadata = Metadata> = {
+    metadata?: M;
+};
+export type HasMetadata<M extends Metadata = Metadata> = HasMetadataSchema<M> & {
+    updateMetadata: (object: M) => void;
 };
 export type HasMetadataInMemoryEntityConstructor<T extends Metadata = Metadata> = Constructor<HasMetadata<T>>;
 export declare function hasMetadataMixin<T extends InMemoryEntity>(item: T): asserts item is T & HasMetadata;
diff --git a/dist/js/entity/mixins/HasScopeTrackMixin.d.ts b/dist/js/entity/mixins/HasScopeTrackMixin.d.ts
index 8e9df8fa..b03d276f 100644
--- a/dist/js/entity/mixins/HasScopeTrackMixin.d.ts
+++ b/dist/js/entity/mixins/HasScopeTrackMixin.d.ts
@@ -1,8 +1,11 @@
 import { InMemoryEntity } from "../in_memory";
+type ScopeTrackSchema = {
+    scopeTrack?: unknown[];
+};
 type ScopeTrackDescriptor = {
     get scopeTrack(): unknown[];
     set scopeTrack(array: unknown[]);
 };
-export declare function hasScopeTrackMixin(item: InMemoryEntity): InMemoryEntity & ScopeTrackDescriptor;
+export declare function hasScopeTrackMixin(item: InMemoryEntity): InMemoryEntity<ScopeTrackSchema> & ScopeTrackDescriptor;
 export type HasScopeTrackInMemoryEntity = ReturnType<typeof hasScopeTrackMixin>;
 export {};
diff --git a/dist/js/entity/mixins/HasScopeTrackMixin.js b/dist/js/entity/mixins/HasScopeTrackMixin.js
index 11b85ab2..35bd2f2a 100644
--- a/dist/js/entity/mixins/HasScopeTrackMixin.js
+++ b/dist/js/entity/mixins/HasScopeTrackMixin.js
@@ -5,7 +5,8 @@ function schemaMixin(item) {
     // @ts-expect-error
     const properties = {
         get scopeTrack() {
-            return this.prop("scopeTrack", []);
+            var _a;
+            return (_a = this.prop("scopeTrack")) !== null && _a !== void 0 ? _a : [];
         },
         set scopeTrack(array) {
             this.setProp("scopeTrack", array);
diff --git a/dist/js/entity/mixins/HashedEntityMixin.d.ts b/dist/js/entity/mixins/HashedEntityMixin.d.ts
index 178b857b..253c0d82 100644
--- a/dist/js/entity/mixins/HashedEntityMixin.d.ts
+++ b/dist/js/entity/mixins/HashedEntityMixin.d.ts
@@ -1,6 +1,7 @@
+import { type HashedSchemaMixin } from "../../generated/HashedSchemaMixin";
 import type { Constructor } from "../../utils/types";
 import { InMemoryEntity } from "../in_memory";
-export type HashedEntity = {
+export type HashedEntity = HashedSchemaMixin & {
     calculateHash(): string;
     getHashObject?(): object;
 };
diff --git a/dist/js/entity/mixins/HashedEntityMixin.js b/dist/js/entity/mixins/HashedEntityMixin.js
index d365abc1..c4debfbc 100644
--- a/dist/js/entity/mixins/HashedEntityMixin.js
+++ b/dist/js/entity/mixins/HashedEntityMixin.js
@@ -1,8 +1,10 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.hashedEntityMixin = hashedEntityMixin;
+const HashedSchemaMixin_1 = require("../../generated/HashedSchemaMixin");
 const hash_1 = require("../../utils/hash");
 function hashedEntityMixin(item) {
+    (0, HashedSchemaMixin_1.hashedSchemaMixin)(item);
     // @ts-expect-error
     const properties = {
         /**
diff --git a/dist/js/entity/mixins/ImportantSettingsProviderMixin.d.ts b/dist/js/entity/mixins/ImportantSettingsProviderMixin.d.ts
deleted file mode 100644
index 9cb5ce49..00000000
--- a/dist/js/entity/mixins/ImportantSettingsProviderMixin.d.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import type { Constructor } from "../../utils/types";
-import type { InMemoryEntity } from "../in_memory";
-export interface ContextProvider {
-    domain?: string;
-}
-export type ImportantSettingsProvider = {
-    important: object;
-    setImportant(key: string, value: unknown): void;
-    importantSettingsProviders: ContextProvider[];
-    isImportantEdited: boolean | undefined;
-};
-type AbstractBase = {
-    contextProviders: ContextProvider[];
-};
-export type ImportantSettingsProviderInMemoryEntityConstructor = Constructor<ImportantSettingsProvider>;
-export declare function importantSettingsProviderMixin<T extends InMemoryEntity & AbstractBase>(item: T): asserts item is T & ImportantSettingsProvider;
-export {};
diff --git a/dist/js/entity/mixins/ImportantSettingsProviderMixin.js b/dist/js/entity/mixins/ImportantSettingsProviderMixin.js
deleted file mode 100644
index b4477d54..00000000
--- a/dist/js/entity/mixins/ImportantSettingsProviderMixin.js
+++ /dev/null
@@ -1,25 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.importantSettingsProviderMixin = importantSettingsProviderMixin;
-const clone_1 = require("../../utils/clone");
-function importantSettingsProviderMixin(item) {
-    // @ts-expect-error
-    const properties = {
-        get important() {
-            return (0, clone_1.deepClone)(this._json.important || {});
-        },
-        setImportant(key, value) {
-            this.setProp("important", { [key]: value });
-        },
-        get importantSettingsProviders() {
-            return this.contextProviders.filter((p) => p.domain === "important");
-        },
-        get isImportantEdited() {
-            return this.prop("important.isEdited");
-        },
-        set isImportantEdited(bool) {
-            this.setProp("important", Object.assign(this.important, { isEdited: bool }));
-        },
-    };
-    Object.defineProperties(item, Object.getOwnPropertyDescriptors(properties));
-}
diff --git a/dist/js/entity/mixins/ValidatableMixin.d.ts b/dist/js/entity/mixins/ValidatableMixin.d.ts
new file mode 100644
index 00000000..db9792a0
--- /dev/null
+++ b/dist/js/entity/mixins/ValidatableMixin.d.ts
@@ -0,0 +1,30 @@
+import { JSONSchema } from "@mat3ra/esse/dist/js/esse/utils";
+import type { AbstractConstructor, Constructor } from "../../utils/types";
+import { InMemoryEntity } from "../in_memory";
+export type Validatable = {
+    validate(): void;
+    isValid(): boolean;
+    clean<T extends object>(config: T): T;
+};
+export type ValidatableInMemoryStaticEntity = {
+    validateData(data: object, clean?: boolean, jsonSchema?: JSONSchema): object;
+    allowJsonSchemaTypesCoercing: boolean;
+    readonly jsonSchema?: JSONSchema;
+};
+export type ValidatableInMemoryEntityConstructor = Constructor<Validatable> & ValidatableInMemoryStaticEntity;
+/**
+ * Opt-in AJV validation for InMemoryEntity subclasses.
+ *
+ * Apply on the constructor (adds static + prototype members):
+ *
+ * ```ts
+ * interface MyEntity extends Validatable {}
+ * class MyEntity extends InMemoryEntity<MySchema> {
+ *     static readonly jsonSchema = mySchema;
+ * }
+ * validatableEntityMixin(MyEntity);
+ * ```
+ *
+ * Idempotent: safe to call more than once on the same class.
+ */
+export declare function validatableEntityMixin(Item: AbstractConstructor<InMemoryEntity>): void;
diff --git a/dist/js/entity/mixins/ValidatableMixin.js b/dist/js/entity/mixins/ValidatableMixin.js
new file mode 100644
index 00000000..9fabe9f4
--- /dev/null
+++ b/dist/js/entity/mixins/ValidatableMixin.js
@@ -0,0 +1,93 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.validatableEntityMixin = validatableEntityMixin;
+const omit_1 = __importDefault(require("lodash/omit"));
+const clone_1 = require("../../utils/clone");
+const in_memory_1 = require("../in_memory");
+const validateEntityData_1 = require("../validateEntityData");
+const validatableEntityMixinApplied = Symbol("validatableEntityMixinApplied");
+function validatableEntityStaticMixin(Item) {
+    // @ts-expect-error — assigning mixin statics onto constructor
+    const staticProperties = {
+        allowJsonSchemaTypesCoercing: false,
+        validateData(data, clean, jsonSchema) {
+            return (0, validateEntityData_1.validateEntityData)(data, jsonSchema !== null && jsonSchema !== void 0 ? jsonSchema : this.jsonSchema, {
+                clean: clean !== null && clean !== void 0 ? clean : false,
+                coerceTypes: this.allowJsonSchemaTypesCoercing,
+            });
+        },
+    };
+    Object.defineProperties(Item, Object.getOwnPropertyDescriptors(staticProperties));
+}
+function validatableEntityInstanceMixin(item) {
+    // @ts-expect-error — assigning mixin instance methods onto prototype
+    const properties = {
+        validate() {
+            const ctr = this.constructor;
+            if (this._json) {
+                ctr.validateData(this._json);
+            }
+        },
+        isValid() {
+            try {
+                this.validate();
+                return true;
+            }
+            catch (_a) {
+                return false;
+            }
+        },
+        clean(config) {
+            var _a, _b, _c;
+            try {
+                const ctr = this.constructor;
+                return ctr.validateData(config, true);
+            }
+            catch (err) {
+                if (err instanceof in_memory_1.EntityError) {
+                    console.error({
+                        error: JSON.stringify((_a = err.details) === null || _a === void 0 ? void 0 : _a.error),
+                        json: JSON.stringify((_b = err.details) === null || _b === void 0 ? void 0 : _b.json),
+                        schema: JSON.stringify((_c = err.details) === null || _c === void 0 ? void 0 : _c.schema),
+                    });
+                }
+                throw err;
+            }
+        },
+        toJSON(exclude = []) {
+            const ctr = this.constructor;
+            const json = ctr._isDeepCloneRequired
+                ? (0, clone_1.deepClone)((0, omit_1.default)(this._json, exclude))
+                : (0, clone_1.clone)((0, omit_1.default)(this._json, exclude));
+            return this.clean(json);
+        },
+    };
+    Object.defineProperties(item, Object.getOwnPropertyDescriptors(properties));
+}
+/**
+ * Opt-in AJV validation for InMemoryEntity subclasses.
+ *
+ * Apply on the constructor (adds static + prototype members):
+ *
+ * ```ts
+ * interface MyEntity extends Validatable {}
+ * class MyEntity extends InMemoryEntity<MySchema> {
+ *     static readonly jsonSchema = mySchema;
+ * }
+ * validatableEntityMixin(MyEntity);
+ * ```
+ *
+ * Idempotent: safe to call more than once on the same class.
+ */
+function validatableEntityMixin(Item) {
+    const ctor = Item;
+    if (ctor[validatableEntityMixinApplied]) {
+        return;
+    }
+    validatableEntityStaticMixin(Item);
+    validatableEntityInstanceMixin(Item.prototype);
+    ctor[validatableEntityMixinApplied] = true;
+}
diff --git a/dist/js/entity/set/InMemoryEntitySetBaseMixin.d.ts b/dist/js/entity/set/InMemoryEntitySetBaseMixin.d.ts
index 0b937881..ff1cac00 100644
--- a/dist/js/entity/set/InMemoryEntitySetBaseMixin.d.ts
+++ b/dist/js/entity/set/InMemoryEntitySetBaseMixin.d.ts
@@ -1,19 +1,21 @@
-import { type EntitySetSchema, SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
+import { type BaseInMemoryEntitySchema, type EntitySetSchema, SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
 import { type InMemoryEntity } from "../in_memory";
 export type SystemInSet = Required<SystemInSetSchema>;
 export type InSet = SystemInSet["inSet"][0];
+type EntitySetEntitySchema = BaseInMemoryEntitySchema & EntitySetSchema;
 export declare enum EntitySetType {
     ordered = "ordered",
     unordered = "unordered"
 }
-declare function schemaMixin<E extends InMemoryEntity>(item: E): InMemoryEntity & EntitySetSchema;
 type EntitySetBaseMethodsDescriptor = {
     toJSONForInclusionInEntity(): {
         _id: string;
         type: string;
     };
 };
-declare function methodsMixin<E extends InMemoryEntity>(item: E & EntitySetSchema): InMemoryEntity & EntitySetSchema & EntitySetBaseMethodsDescriptor;
-export type InMemoryEntitySetBase = ReturnType<typeof schemaMixin> & ReturnType<typeof methodsMixin>;
-export declare function inMemoryEntitySetBaseMixin<T extends InMemoryEntity>(item: T): asserts item is T & InMemoryEntitySetBase;
+/** Mixin shape only — safe to merge into schema-generic subclasses (no baked-in `_json`). */
+export type InMemoryEntitySetBaseMixin = EntitySetSchema & EntitySetBaseMethodsDescriptor;
+/** Instance type with default entity-set schema (includes `InMemoryEntity<_json>`). */
+export type InMemoryEntitySetBase = InMemoryEntity<EntitySetEntitySchema> & InMemoryEntitySetBaseMixin;
+export declare function inMemoryEntitySetBaseMixin<T extends InMemoryEntity>(item: T): asserts item is T & InMemoryEntitySetBaseMixin;
 export {};
diff --git a/dist/js/entity/set/InMemoryEntitySetMixin.d.ts b/dist/js/entity/set/InMemoryEntitySetMixin.d.ts
index 4d16c78f..ca94a280 100644
--- a/dist/js/entity/set/InMemoryEntitySetMixin.d.ts
+++ b/dist/js/entity/set/InMemoryEntitySetMixin.d.ts
@@ -5,4 +5,4 @@ export type InSet = SystemInSet["inSet"][0];
 export type InMemoryEntitySet = {
     containsEntity(entity?: SystemInSetSchema): boolean;
 };
-export declare function inMemoryEntitySetMixin<T extends InMemoryEntity>(item: T): InMemoryEntity & InMemoryEntitySet;
+export declare function inMemoryEntitySetMixin<T extends InMemoryEntity>(item: T): InMemoryEntity<import("@mat3ra/esse/dist/js/types").BaseInMemoryEntitySchema> & InMemoryEntitySet;
diff --git a/dist/js/entity/set/factory.d.ts b/dist/js/entity/set/factory.d.ts
deleted file mode 100644
index 400063c7..00000000
--- a/dist/js/entity/set/factory.d.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-import { AnyObject } from "@mat3ra/esse/dist/js/esse/types";
-import { EntitySetSchema } from "@mat3ra/esse/dist/js/types";
-import { InMemoryEntity } from "../in_memory";
-export declare const constructEntitySetFactoryByConfig: ({ entitySetCls }: {
-    entitySetCls?: typeof InMemoryEntity | undefined;
-}) => (config: AnyObject, entityCls: EntitySetSchema["entityCls"]) => InMemoryEntity;
diff --git a/dist/js/entity/set/factory.js b/dist/js/entity/set/factory.js
deleted file mode 100644
index 7c8c6f25..00000000
--- a/dist/js/entity/set/factory.js
+++ /dev/null
@@ -1,12 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.constructEntitySetFactoryByConfig = void 0;
-const in_memory_1 = require("../in_memory");
-const constructEntitySetFactoryByConfig = ({ entitySetCls = in_memory_1.InMemoryEntity }) => (config, entityCls) => {
-    const Cls = entitySetCls;
-    return new Cls({
-        ...config,
-        entityCls,
-    });
-};
-exports.constructEntitySetFactoryByConfig = constructEntitySetFactoryByConfig;
diff --git a/dist/js/entity/validateEntityData.d.ts b/dist/js/entity/validateEntityData.d.ts
new file mode 100644
index 00000000..cb070978
--- /dev/null
+++ b/dist/js/entity/validateEntityData.d.ts
@@ -0,0 +1,10 @@
+import { JSONSchema } from "@mat3ra/esse/dist/js/esse/utils";
+export type ValidateEntityDataOptions = {
+    clean?: boolean;
+    coerceTypes?: boolean;
+};
+/**
+ * Validate (and optionally clean) entity data against a JSON schema.
+ * Returns `data` unchanged when no schema is provided.
+ */
+export declare function validateEntityData(data: object, jsonSchema: JSONSchema | undefined, options?: ValidateEntityDataOptions): object;
diff --git a/dist/js/entity/validateEntityData.js b/dist/js/entity/validateEntityData.js
new file mode 100644
index 00000000..90aeeac0
--- /dev/null
+++ b/dist/js/entity/validateEntityData.js
@@ -0,0 +1,62 @@
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    var desc = Object.getOwnPropertyDescriptor(m, k);
+    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
+      desc = { enumerable: true, get: function() { return m[k]; } };
+    }
+    Object.defineProperty(o, k2, desc);
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || (function () {
+    var ownKeys = function(o) {
+        ownKeys = Object.getOwnPropertyNames || function (o) {
+            var ar = [];
+            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
+            return ar;
+        };
+        return ownKeys(o);
+    };
+    return function (mod) {
+        if (mod && mod.__esModule) return mod;
+        var result = {};
+        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
+        __setModuleDefault(result, mod);
+        return result;
+    };
+})();
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.validateEntityData = validateEntityData;
+const ajv = __importStar(require("@mat3ra/esse/dist/js/utils/ajv"));
+const in_memory_1 = require("./in_memory");
+/**
+ * Validate (and optionally clean) entity data against a JSON schema.
+ * Returns `data` unchanged when no schema is provided.
+ */
+function validateEntityData(data, jsonSchema, options = {}) {
+    if (!jsonSchema) {
+        return data;
+    }
+    const { clean = false, coerceTypes = false } = options;
+    const result = clean
+        ? ajv.validateAndClean(data, jsonSchema, { coerceTypes })
+        : ajv.validate(data, jsonSchema);
+    if (!result.isValid) {
+        throw new in_memory_1.EntityError({
+            code: in_memory_1.ValidationErrorCode.IN_MEMORY_ENTITY_DATA_INVALID,
+            details: {
+                error: result === null || result === void 0 ? void 0 : result.errors,
+                json: data,
+                schema: jsonSchema,
+            },
+        });
+    }
+    return data;
+}
diff --git a/dist/js/generateSchemaMixin.js b/dist/js/generateSchemaMixin.js
index 44a775ce..e6d168f5 100644
--- a/dist/js/generateSchemaMixin.js
+++ b/dist/js/generateSchemaMixin.js
@@ -82,7 +82,7 @@ function generateMixinFunction(schema, schemaName, mixinTypeName, entityTypeName
     // Filter out skip fields
     const propertyEntries = Object.entries(properties).filter(([propertyName]) => !skipFields.includes(propertyName));
     let code = `import type { InMemoryEntity } from "${entityFrom}";\n`;
-    code += `import type { ${schemaName} } from "${from}";\n\n`;
+    code += `import type { BaseInMemoryEntitySchema, ${schemaName} } from "${from}";\n\n`;
     // Generate the mixin type - only use Omit if skipFields has values
     if (skipFields && skipFields.length > 0) {
         const skipFieldNames = skipFields.map((field) => `"${field}"`).join(" | ");
@@ -91,20 +91,20 @@ function generateMixinFunction(schema, schemaName, mixinTypeName, entityTypeName
     else {
         code += `export type ${mixinTypeName} = ${schemaName};\n\n`;
     }
-    // Generate the entity type
-    code += `export type ${entityTypeName} = InMemoryEntity & ${mixinTypeName};\n\n`;
+    // Entity schema must include base fields so `_json` / `toJSON` stay compatible with InMemoryEntity
+    code += `export type ${entityTypeName} = InMemoryEntity<BaseInMemoryEntitySchema & ${mixinTypeName}>;\n\n`;
     code += `export function ${functionName}<T extends InMemoryEntity>(\n`;
     code += `    item: InMemoryEntity,\n`;
     code += `): asserts item is T & ${mixinTypeName} {\n`;
     code += `    // @ts-expect-error\n`;
-    code += `    const properties: InMemoryEntity & ${mixinTypeName} = {\n`;
+    code += `    const properties: InMemoryEntity<${mixinTypeName}> & ${mixinTypeName} = {\n`;
     for (let i = 0; i < propertyEntries.length; i++) {
         const [propertyName] = propertyEntries[i];
         const isRequired = isRequiredProperty(propertyName, required);
         const methodName = isRequired ? "requiredProp" : "prop";
         const typeAnnotation = generateTypeAnnotation(propertyName, schemaName);
         code += `get ${propertyName}() {\n`;
-        code += `return this.${methodName}<${typeAnnotation}>("${propertyName}");\n`;
+        code += `return this.${methodName}("${propertyName}");\n`;
         code += `},\n`;
         code += `set ${propertyName}(value: ${typeAnnotation}) {\n`;
         code += `this.setProp("${propertyName}", value);\n`;
diff --git a/dist/js/generated/BankableSchemaMixin.d.ts b/dist/js/generated/BankableSchemaMixin.d.ts
new file mode 100644
index 00000000..b5177b25
--- /dev/null
+++ b/dist/js/generated/BankableSchemaMixin.d.ts
@@ -0,0 +1,5 @@
+import type { BankableSchema, BaseInMemoryEntitySchema } from "@mat3ra/esse/dist/js/types";
+import type { InMemoryEntity } from "../entity/in_memory";
+export type BankableSchemaMixin = BankableSchema;
+export type BankableInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & BankableSchemaMixin>;
+export declare function bankableSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & BankableSchemaMixin;
diff --git a/dist/js/generated/BankableSchemaMixin.js b/dist/js/generated/BankableSchemaMixin.js
new file mode 100644
index 00000000..7350b8ea
--- /dev/null
+++ b/dist/js/generated/BankableSchemaMixin.js
@@ -0,0 +1,15 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.bankableSchemaMixin = bankableSchemaMixin;
+function bankableSchemaMixin(item) {
+    // @ts-expect-error
+    const properties = {
+        get exabyteId() {
+            return this.requiredProp("exabyteId");
+        },
+        set exabyteId(value) {
+            this.setProp("exabyteId", value);
+        },
+    };
+    Object.defineProperties(item, Object.getOwnPropertyDescriptors(properties));
+}
diff --git a/dist/js/generated/DefaultableSchemaMixin.d.ts b/dist/js/generated/DefaultableSchemaMixin.d.ts
index e254e5c4..bf608636 100644
--- a/dist/js/generated/DefaultableSchemaMixin.d.ts
+++ b/dist/js/generated/DefaultableSchemaMixin.d.ts
@@ -1,5 +1,5 @@
-import type { DefaultableEntitySchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, DefaultableEntitySchema } from "@mat3ra/esse/dist/js/types";
 import type { InMemoryEntity } from "../entity/in_memory";
 export type DefaultableSchemaMixin = DefaultableEntitySchema;
-export type DefaultableInMemoryEntity = InMemoryEntity & DefaultableSchemaMixin;
+export type DefaultableInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & DefaultableSchemaMixin>;
 export declare function defaultableSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & DefaultableSchemaMixin;
diff --git a/dist/js/generated/HasConsistencyChecksSchemaMixin.d.ts b/dist/js/generated/HasConsistencyChecksSchemaMixin.d.ts
index 9266913b..599f9735 100644
--- a/dist/js/generated/HasConsistencyChecksSchemaMixin.d.ts
+++ b/dist/js/generated/HasConsistencyChecksSchemaMixin.d.ts
@@ -1,5 +1,5 @@
-import type { HasConsistencyCheckSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, HasConsistencyCheckSchema } from "@mat3ra/esse/dist/js/types";
 import type { InMemoryEntity } from "../entity/in_memory";
 export type HasConsistencyChecksSchemaMixin = HasConsistencyCheckSchema;
-export type HasConsistencyChecksInMemoryEntity = InMemoryEntity & HasConsistencyChecksSchemaMixin;
+export type HasConsistencyChecksInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & HasConsistencyChecksSchemaMixin>;
 export declare function hasConsistencyChecksSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & HasConsistencyChecksSchemaMixin;
diff --git a/dist/js/generated/HasConsistencyChecksSchemaMixin.js b/dist/js/generated/HasConsistencyChecksSchemaMixin.js
index a5f3e02c..5db5cf1e 100644
--- a/dist/js/generated/HasConsistencyChecksSchemaMixin.js
+++ b/dist/js/generated/HasConsistencyChecksSchemaMixin.js
@@ -5,7 +5,7 @@ function hasConsistencyChecksSchemaMixin(item) {
     // @ts-expect-error
     const properties = {
         get consistencyChecks() {
-            return this.prop("consistencyChecks", []);
+            return this.prop("consistencyChecks");
         },
         set consistencyChecks(value) {
             this.setProp("consistencyChecks", value);
diff --git a/dist/js/generated/HasDescriptionSchemaMixin.d.ts b/dist/js/generated/HasDescriptionSchemaMixin.d.ts
index 5fbec77d..bc7b4609 100644
--- a/dist/js/generated/HasDescriptionSchemaMixin.d.ts
+++ b/dist/js/generated/HasDescriptionSchemaMixin.d.ts
@@ -1,5 +1,5 @@
-import type { DescriptionSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, DescriptionSchema } from "@mat3ra/esse/dist/js/types";
 import type { InMemoryEntity } from "../entity/in_memory";
 export type HasDescriptionSchemaMixin = DescriptionSchema;
-export type HasDescriptionInMemoryEntity = InMemoryEntity & HasDescriptionSchemaMixin;
+export type HasDescriptionInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & HasDescriptionSchemaMixin>;
 export declare function hasDescriptionSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & HasDescriptionSchemaMixin;
diff --git a/dist/js/generated/HashedSchemaMixin.d.ts b/dist/js/generated/HashedSchemaMixin.d.ts
new file mode 100644
index 00000000..355e3e7b
--- /dev/null
+++ b/dist/js/generated/HashedSchemaMixin.d.ts
@@ -0,0 +1,5 @@
+import type { BaseInMemoryEntitySchema, HashedSchema } from "@mat3ra/esse/dist/js/types";
+import type { InMemoryEntity } from "../entity/in_memory";
+export type HashedSchemaMixin = HashedSchema;
+export type HashedInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & HashedSchemaMixin>;
+export declare function hashedSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & HashedSchemaMixin;
diff --git a/dist/js/generated/HashedSchemaMixin.js b/dist/js/generated/HashedSchemaMixin.js
new file mode 100644
index 00000000..eb97531b
--- /dev/null
+++ b/dist/js/generated/HashedSchemaMixin.js
@@ -0,0 +1,15 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.hashedSchemaMixin = hashedSchemaMixin;
+function hashedSchemaMixin(item) {
+    // @ts-expect-error
+    const properties = {
+        get hash() {
+            return this.requiredProp("hash");
+        },
+        set hash(value) {
+            this.setProp("hash", value);
+        },
+    };
+    Object.defineProperties(item, Object.getOwnPropertyDescriptors(properties));
+}
diff --git a/dist/js/generated/InSetSchemaMixin.d.ts b/dist/js/generated/InSetSchemaMixin.d.ts
index 21c2022f..52ed1f69 100644
--- a/dist/js/generated/InSetSchemaMixin.d.ts
+++ b/dist/js/generated/InSetSchemaMixin.d.ts
@@ -1,5 +1,5 @@
-import type { SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
 import type { InMemoryEntity } from "../entity/in_memory";
 export type InSetSchemaMixin = SystemInSetSchema;
-export type InSetInMemoryEntity = InMemoryEntity & InSetSchemaMixin;
+export type InSetInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & InSetSchemaMixin>;
 export declare function inSetSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & InSetSchemaMixin;
diff --git a/dist/js/generated/NamedEntitySchemaMixin.d.ts b/dist/js/generated/NamedEntitySchemaMixin.d.ts
index 441041c5..b75a5d18 100644
--- a/dist/js/generated/NamedEntitySchemaMixin.d.ts
+++ b/dist/js/generated/NamedEntitySchemaMixin.d.ts
@@ -1,5 +1,5 @@
-import type { NameEntitySchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, NameEntitySchema } from "@mat3ra/esse/dist/js/types";
 import type { InMemoryEntity } from "../entity/in_memory";
 export type NamedEntitySchemaMixin = NameEntitySchema;
-export type NamedEntityInMemoryEntity = InMemoryEntity & NamedEntitySchemaMixin;
+export type NamedEntityInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & NamedEntitySchemaMixin>;
 export declare function namedEntitySchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & NamedEntitySchemaMixin;
diff --git a/dist/js/generated/RuntimeItemsSchemaMixin.d.ts b/dist/js/generated/RuntimeItemsSchemaMixin.d.ts
index 7de1b3d1..d56e0901 100644
--- a/dist/js/generated/RuntimeItemsSchemaMixin.d.ts
+++ b/dist/js/generated/RuntimeItemsSchemaMixin.d.ts
@@ -1,5 +1,5 @@
-import type { RuntimeItemsSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, RuntimeItemsSchema } from "@mat3ra/esse/dist/js/types";
 import type { InMemoryEntity } from "../entity/in_memory";
 export type RuntimeItemsSchemaMixin = RuntimeItemsSchema;
-export type RuntimeItemsInMemoryEntity = InMemoryEntity & RuntimeItemsSchemaMixin;
+export type RuntimeItemsInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & RuntimeItemsSchemaMixin>;
 export declare function runtimeItemsSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & RuntimeItemsSchemaMixin;
diff --git a/dist/js/generated/TaggableSchemaMixin.d.ts b/dist/js/generated/TaggableSchemaMixin.d.ts
index a2ced7e6..e1417801 100644
--- a/dist/js/generated/TaggableSchemaMixin.d.ts
+++ b/dist/js/generated/TaggableSchemaMixin.d.ts
@@ -1,5 +1,5 @@
-import type { EntityTagsSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, EntityTagsSchema } from "@mat3ra/esse/dist/js/types";
 import type { InMemoryEntity } from "../entity/in_memory";
 export type TaggableSchemaMixin = EntityTagsSchema;
-export type TaggableInMemoryEntity = InMemoryEntity & TaggableSchemaMixin;
+export type TaggableInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & TaggableSchemaMixin>;
 export declare function taggableSchemaMixin<T extends InMemoryEntity>(item: InMemoryEntity): asserts item is T & TaggableSchemaMixin;
diff --git a/dist/js/generated/TaggableSchemaMixin.js b/dist/js/generated/TaggableSchemaMixin.js
index fb57c06a..86018a67 100644
--- a/dist/js/generated/TaggableSchemaMixin.js
+++ b/dist/js/generated/TaggableSchemaMixin.js
@@ -5,7 +5,7 @@ function taggableSchemaMixin(item) {
     // @ts-expect-error
     const properties = {
         get tags() {
-            return this.prop("tags", []);
+            return this.prop("tags");
         },
         set tags(value) {
             this.setProp("tags", value);
diff --git a/dist/js/index.d.ts b/dist/js/index.d.ts
index d52bc1d8..4eaa4bef 100644
--- a/dist/js/index.d.ts
+++ b/dist/js/index.d.ts
@@ -2,10 +2,12 @@ import { ArrayWithIds, RoundedArrayWithIds } from "./ArrayWithIds";
 import * as context from "./context";
 import * as entity from "./entity";
 import * as utils from "./utils";
+import * as validator from "./validator";
 import { RoundedValueWithId, ValueWithId } from "./ValueWithId";
 import { RoundedVector3D, Vector3D } from "./vector";
 export { ArrayWithIds, ValueWithId, RoundedValueWithId, RoundedArrayWithIds, RoundedVector3D, Vector3D, };
-export { entity, context, utils };
+export { entity, context, utils, validator };
+export { JsonSchemaValidator, jsonSchemaValidator } from "./validator";
 declare const Code: {
     ArrayWithIds: typeof ArrayWithIds;
     ValueWithId: typeof ValueWithId;
@@ -16,6 +18,7 @@ declare const Code: {
     entity: typeof entity;
     context: typeof context;
     utils: typeof utils;
+    validator: typeof validator;
 };
 export type CodeType = typeof Code;
 export default Code;
diff --git a/dist/js/index.js b/dist/js/index.js
index 846b45f8..6fbe16c2 100644
--- a/dist/js/index.js
+++ b/dist/js/index.js
@@ -33,7 +33,7 @@ var __importStar = (this && this.__importStar) || (function () {
     };
 })();
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.utils = exports.context = exports.entity = exports.Vector3D = exports.RoundedVector3D = exports.RoundedArrayWithIds = exports.RoundedValueWithId = exports.ValueWithId = exports.ArrayWithIds = void 0;
+exports.jsonSchemaValidator = exports.JsonSchemaValidator = exports.validator = exports.utils = exports.context = exports.entity = exports.Vector3D = exports.RoundedVector3D = exports.RoundedArrayWithIds = exports.RoundedValueWithId = exports.ValueWithId = exports.ArrayWithIds = void 0;
 const ArrayWithIds_1 = require("./ArrayWithIds");
 Object.defineProperty(exports, "ArrayWithIds", { enumerable: true, get: function () { return ArrayWithIds_1.ArrayWithIds; } });
 Object.defineProperty(exports, "RoundedArrayWithIds", { enumerable: true, get: function () { return ArrayWithIds_1.RoundedArrayWithIds; } });
@@ -43,12 +43,17 @@ const entity = __importStar(require("./entity"));
 exports.entity = entity;
 const utils = __importStar(require("./utils"));
 exports.utils = utils;
+const validator = __importStar(require("./validator"));
+exports.validator = validator;
 const ValueWithId_1 = require("./ValueWithId");
 Object.defineProperty(exports, "RoundedValueWithId", { enumerable: true, get: function () { return ValueWithId_1.RoundedValueWithId; } });
 Object.defineProperty(exports, "ValueWithId", { enumerable: true, get: function () { return ValueWithId_1.ValueWithId; } });
 const vector_1 = require("./vector");
 Object.defineProperty(exports, "RoundedVector3D", { enumerable: true, get: function () { return vector_1.RoundedVector3D; } });
 Object.defineProperty(exports, "Vector3D", { enumerable: true, get: function () { return vector_1.Vector3D; } });
+var validator_1 = require("./validator");
+Object.defineProperty(exports, "JsonSchemaValidator", { enumerable: true, get: function () { return validator_1.JsonSchemaValidator; } });
+Object.defineProperty(exports, "jsonSchemaValidator", { enumerable: true, get: function () { return validator_1.jsonSchemaValidator; } });
 const Code = {
     ArrayWithIds: ArrayWithIds_1.ArrayWithIds,
     ValueWithId: ValueWithId_1.ValueWithId,
@@ -59,5 +64,6 @@ const Code = {
     entity,
     context,
     utils,
+    validator,
 };
 exports.default = Code;
diff --git a/dist/js/utils/graph.d.ts b/dist/js/utils/graph.d.ts
index 61811463..0c53651d 100644
--- a/dist/js/utils/graph.d.ts
+++ b/dist/js/utils/graph.d.ts
@@ -1,9 +1,6 @@
+import type { SubworkflowUnitSchema } from "@mat3ra/esse/dist/js/types";
 import { InMemoryEntity } from "../entity/in_memory";
-export type UnitEntity = InMemoryEntity & {
-    head: boolean;
-    next?: string;
-    flowchartId: string;
-};
+export type UnitEntity = SubworkflowUnitSchema & InMemoryEntity<SubworkflowUnitSchema>;
 /**
  * @summary Set the head of an array of units
  */
diff --git a/dist/js/validator/JsonSchemaValidator.d.ts b/dist/js/validator/JsonSchemaValidator.d.ts
new file mode 100644
index 00000000..5c1bbac8
--- /dev/null
+++ b/dist/js/validator/JsonSchemaValidator.d.ts
@@ -0,0 +1,127 @@
+import Ajv, { ErrorObject } from "ajv";
+import type { AnyObject, ValidationSchema } from "./types";
+type ErrorResult = {
+    [key: string]: string | ErrorResult;
+};
+export type JsonSchemaValidatorOptions = {
+    /**
+     * Delete object properties whose value is `null` before AJV (default: `true`).
+     * Nested objects are walked; array elements are not removed.
+     */
+    removeNull?: boolean;
+    /**
+     * Delete object properties whose value is `""` before AJV (default: `true`).
+     * Keep `false` when empty strings are intentional placeholders (e.g. flowchart links).
+     */
+    removeEmptyStrings?: boolean;
+};
+export declare class JsonSchemaValidator {
+    private readonly ajv;
+    private readonly removeNull;
+    private readonly removeEmptyStrings;
+    private readonly formatCodeMap;
+    private readonly keywordsCodeMap;
+    constructor({ removeNull, removeEmptyStrings }?: JsonSchemaValidatorOptions);
+    /**
+     * Register host-specific AJV formats/keywords (e.g. web-app password/phone) on this instance.
+     */
+    registerExtensions(register: (ajvInstance: Ajv) => void): void;
+    private getCompiledValidator;
+    /**
+     * Simplify AJV errors into LIVR-inspired field → code maps for API responses.
+     * Inspired by https://github.com/koorchik/LIVR
+     *
+     * @example of raw AJV errors:
+     * [
+     *     {
+     *         "instancePath": "",
+     *         "schemaPath": "#/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "intent"
+     *         },
+     *         "message": "must have required property 'intent'"
+     *     },
+     *     {
+     *         "instancePath": "/user",
+     *         "schemaPath": "#/properties/user/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "username"
+     *         },
+     *         "message": "must have required property 'username'"
+     *     },
+     *     {
+     *         "instancePath": "/user",
+     *         "schemaPath": "#/properties/user/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "fullname"
+     *         },
+     *         "message": "must have required property 'fullname'"
+     *     },
+     *     {
+     *         "instancePath": "/user/termsAccepted",
+     *         "schemaPath": "#/properties/user/properties/termsAccepted/type",
+     *         "keyword": "type",
+     *         "params": {
+     *             "type": "boolean"
+     *         },
+     *         "message": "must be boolean"
+     *     },
+     *     {
+     *         "instancePath": "/user/termsAccepted",
+     *         "schemaPath": "#/properties/user/properties/termsAccepted/enum",
+     *         "keyword": "enum",
+     *         "params": {
+     *             "allowedValues": [
+     *                 true
+     *             ]
+     *         },
+     *         "message": "must be equal to one of the allowed values"
+     *     },
+     *     {
+     *         "instancePath": "/user/password",
+     *         "schemaPath": "#/properties/user/properties/password/equalToField",
+     *         "keyword": "equalToField",
+     *         "params": {},
+     *         "message": "should be equal to the value of \"passwordConfirmation\""
+     *     },
+     *     {
+     *         "instancePath": "/user/passwordConfirmation",
+     *         "schemaPath": "#/properties/user/properties/passwordConfirmation/equalToField",
+     *         "keyword": "equalToField",
+     *         "params": {},
+     *         "message": "should be equal to the value of \"password\""
+     *     }
+     * ]
+     *
+     * @example of the same errors after transformation:
+     * {
+     *     "intent": "REQUIRED",
+     *     "user": {
+     *         "username": "REQUIRED",
+     *         "fullname": "REQUIRED",
+     *         "termsAccepted": "FORMAT_ERROR",
+     *         "password": "FIELDS_NOT_EQUAL",
+     *         "passwordConfirmation": "FIELDS_NOT_EQUAL"
+     *     }
+     * }
+     */
+    transformErrors(errors?: ErrorObject[] | null): ErrorResult | undefined;
+    /**
+     * Validates and cleans data against the schema.
+     * Optionally drops null / empty-string properties (constructor options), then AJV removeAdditional.
+     */
+    validateAndClean(data: AnyObject, jsonSchema: ValidationSchema): {
+        isValid: boolean | Promise<any>;
+        errors: ErrorResult | undefined;
+        rawErrors: ErrorObject<string, Record<string, any>, unknown>[] | null | undefined;
+        validated: {
+            [x: string]: any;
+        };
+    };
+}
+/** Shared singleton — hosts register app formats on this instance (null + "" strip on). */
+export declare const jsonSchemaValidator: JsonSchemaValidator;
+export {};
diff --git a/dist/js/validator/JsonSchemaValidator.js b/dist/js/validator/JsonSchemaValidator.js
new file mode 100644
index 00000000..61826621
--- /dev/null
+++ b/dist/js/validator/JsonSchemaValidator.js
@@ -0,0 +1,239 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.jsonSchemaValidator = exports.JsonSchemaValidator = void 0;
+/**
+ * Standalone AJV validator for cleaning and validating JSON against JSON Schema.
+ *
+ * Why this exists (alongside esse `utils/ajv`):
+ * - Compose schemas with `mergeAllOf` and enforce allowlists via `additionalProperties: false`
+ *   so callers can reject unknown / system-owned fields.
+ * - Optionally strip null / empty-string properties before type checks (see constructor options).
+ * - Map raw AJV errors into stable nested field → code objects (LIVR-style) for consumers that
+ *   need machine-readable validation results.
+ *
+ * Distinct from `@mat3ra/esse` `utils/ajv.validateAndClean` (entity clean: null-only strip used by
+ * `InMemoryEntity.toJSON*`). Prefer this class/API for application validation; register host
+ * formats with {@link JsonSchemaValidator.registerExtensions}.
+ */
+const removeEmptyAndNullProperties_1 = require("@mat3ra/esse/dist/js/utils/removeEmptyAndNullProperties");
+const ajv_1 = __importDefault(require("ajv"));
+const ajv_formats_1 = __importDefault(require("ajv-formats"));
+const ajv_keywords_1 = __importDefault(require("ajv-keywords"));
+const json_pointer_1 = __importDefault(require("json-pointer"));
+const json_schema_merge_allof_1 = __importDefault(require("json-schema-merge-allof"));
+const rules_1 = __importDefault(require("./rules"));
+/**
+ * Recursively deletes empty-string object properties (mutates in place).
+ */
+function removeEmptyStringProperties(obj) {
+    if (typeof obj !== "object" || obj === null) {
+        return obj;
+    }
+    if (Array.isArray(obj)) {
+        obj.forEach((item) => removeEmptyStringProperties(item));
+        return obj;
+    }
+    Object.keys(obj).forEach((key) => {
+        const value = obj[key];
+        if (value === "") {
+            delete obj[key];
+        }
+        else if (typeof value === "object") {
+            removeEmptyStringProperties(value);
+        }
+    });
+    return obj;
+}
+class JsonSchemaValidator {
+    constructor({ removeNull = true, removeEmptyStrings = true } = {}) {
+        this.formatCodeMap = {
+            email: "WRONG_EMAIL",
+            "custom-email": "WRONG_EMAIL",
+            "custom-username": "WRONG_USERNAME",
+            "custom-phone": "WRONG_PHONE",
+            "custom-password": "WRONG_PASSWORD",
+        };
+        this.keywordsCodeMap = {
+            required: "REQUIRED",
+            type: "FORMAT_ERROR",
+            equalToField: "FIELDS_NOT_EQUAL",
+            minLength: "TOO_SHORT",
+            maxLength: "TOO_LONG",
+            isoDate: "WRONG_DATE",
+        };
+        this.removeNull = removeNull;
+        this.removeEmptyStrings = removeEmptyStrings;
+        this.ajv = new ajv_1.default({
+            allErrors: true,
+            useDefaults: true,
+            discriminator: true,
+            removeAdditional: true,
+            coerceTypes: true,
+            allowUnionTypes: true,
+            // Esse / workflow schemas: json-schema-to-typescript-only keywords, and `default` inside
+            // discriminated `oneOf` branches where Ajv still treats nested rules as composite (see
+            // assignDefault + compositeRule). strictSchema would fail compilation for those valid schemas.
+            strictSchema: false,
+        });
+        (0, ajv_formats_1.default)(this.ajv);
+        (0, ajv_keywords_1.default)(this.ajv);
+        (0, rules_1.default)(this.ajv);
+    }
+    /**
+     * Register host-specific AJV formats/keywords (e.g. web-app password/phone) on this instance.
+     */
+    registerExtensions(register) {
+        register(this.ajv);
+    }
+    getCompiledValidator(jsonSchema) {
+        let validate = this.ajv.getSchema(jsonSchema.$id);
+        if (!validate) {
+            const schema = (0, json_schema_merge_allof_1.default)(jsonSchema, { ignoreAdditionalProperties: true });
+            this.ajv.addSchema(schema, jsonSchema.$id);
+            validate = this.ajv.getSchema(jsonSchema.$id);
+        }
+        if (!validate) {
+            throw new Error("JSONSchemasInterface AJV validator error");
+        }
+        return validate;
+    }
+    /**
+     * Simplify AJV errors into LIVR-inspired field → code maps for API responses.
+     * Inspired by https://github.com/koorchik/LIVR
+     *
+     * @example of raw AJV errors:
+     * [
+     *     {
+     *         "instancePath": "",
+     *         "schemaPath": "#/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "intent"
+     *         },
+     *         "message": "must have required property 'intent'"
+     *     },
+     *     {
+     *         "instancePath": "/user",
+     *         "schemaPath": "#/properties/user/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "username"
+     *         },
+     *         "message": "must have required property 'username'"
+     *     },
+     *     {
+     *         "instancePath": "/user",
+     *         "schemaPath": "#/properties/user/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "fullname"
+     *         },
+     *         "message": "must have required property 'fullname'"
+     *     },
+     *     {
+     *         "instancePath": "/user/termsAccepted",
+     *         "schemaPath": "#/properties/user/properties/termsAccepted/type",
+     *         "keyword": "type",
+     *         "params": {
+     *             "type": "boolean"
+     *         },
+     *         "message": "must be boolean"
+     *     },
+     *     {
+     *         "instancePath": "/user/termsAccepted",
+     *         "schemaPath": "#/properties/user/properties/termsAccepted/enum",
+     *         "keyword": "enum",
+     *         "params": {
+     *             "allowedValues": [
+     *                 true
+     *             ]
+     *         },
+     *         "message": "must be equal to one of the allowed values"
+     *     },
+     *     {
+     *         "instancePath": "/user/password",
+     *         "schemaPath": "#/properties/user/properties/password/equalToField",
+     *         "keyword": "equalToField",
+     *         "params": {},
+     *         "message": "should be equal to the value of \"passwordConfirmation\""
+     *     },
+     *     {
+     *         "instancePath": "/user/passwordConfirmation",
+     *         "schemaPath": "#/properties/user/properties/passwordConfirmation/equalToField",
+     *         "keyword": "equalToField",
+     *         "params": {},
+     *         "message": "should be equal to the value of \"password\""
+     *     }
+     * ]
+     *
+     * @example of the same errors after transformation:
+     * {
+     *     "intent": "REQUIRED",
+     *     "user": {
+     *         "username": "REQUIRED",
+     *         "fullname": "REQUIRED",
+     *         "termsAccepted": "FORMAT_ERROR",
+     *         "password": "FIELDS_NOT_EQUAL",
+     *         "passwordConfirmation": "FIELDS_NOT_EQUAL"
+     *     }
+     * }
+     */
+    transformErrors(errors) {
+        if (!errors) {
+            return undefined;
+        }
+        const result = {};
+        errors.forEach((error) => {
+            const code = error.keyword === "format"
+                ? this.formatCodeMap[error.params.format] || "FORMAT_ERROR"
+                : this.keywordsCodeMap[error.keyword] || "FORMAT_ERROR";
+            const instancePath = error.params.missingProperty
+                ? `${error.instancePath}/${error.params.missingProperty}`
+                : error.instancePath;
+            json_pointer_1.default.set(result, instancePath, code);
+        });
+        /**
+         * JSON.parse/JSON.stringify is required to fix <1 empty item> issue.
+         * @example
+         * pointer.set(result, "/nested/prop2/0", "ERROR_1");
+         * pointer.set(result, "/nested/prop2/2", "ERROR_2");
+         *
+         * without JSON.parse/JSON.stringify:
+         * result.prop2 === ["ERROR_1", <1 empty item>, "ERROR_2"]
+         *
+         * with JSON.parse/JSON.stringify:
+         * result.prop2 === ["ERROR_1", null, "ERROR_2"]
+         */
+        return JSON.parse(JSON.stringify(result));
+    }
+    /**
+     * Validates and cleans data against the schema.
+     * Optionally drops null / empty-string properties (constructor options), then AJV removeAdditional.
+     */
+    validateAndClean(data, jsonSchema) {
+        const validated = { ...data };
+        if (this.removeNull) {
+            (0, removeEmptyAndNullProperties_1.removeEmptyAndNullProperties)(validated);
+        }
+        if (this.removeEmptyStrings) {
+            removeEmptyStringProperties(validated);
+        }
+        const compiledValidator = this.getCompiledValidator({
+            ...jsonSchema,
+            additionalProperties: false,
+        });
+        const isValid = compiledValidator(validated);
+        return {
+            isValid,
+            errors: this.transformErrors(compiledValidator.errors || undefined),
+            rawErrors: compiledValidator.errors,
+            validated,
+        };
+    }
+}
+exports.JsonSchemaValidator = JsonSchemaValidator;
+/** Shared singleton — hosts register app formats on this instance (null + "" strip on). */
+exports.jsonSchemaValidator = new JsonSchemaValidator();
diff --git a/dist/js/validator/index.d.ts b/dist/js/validator/index.d.ts
new file mode 100644
index 00000000..202c720a
--- /dev/null
+++ b/dist/js/validator/index.d.ts
@@ -0,0 +1,4 @@
+export { JsonSchemaValidator, jsonSchemaValidator } from "./JsonSchemaValidator";
+export type { JsonSchemaValidatorOptions } from "./JsonSchemaValidator";
+export type { ErrorObject, SchemaObject } from "ajv";
+export type { AnyObject, ValidationSchema } from "./types";
diff --git a/dist/js/validator/index.js b/dist/js/validator/index.js
new file mode 100644
index 00000000..2dc9ae91
--- /dev/null
+++ b/dist/js/validator/index.js
@@ -0,0 +1,6 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.jsonSchemaValidator = exports.JsonSchemaValidator = void 0;
+var JsonSchemaValidator_1 = require("./JsonSchemaValidator");
+Object.defineProperty(exports, "JsonSchemaValidator", { enumerable: true, get: function () { return JsonSchemaValidator_1.JsonSchemaValidator; } });
+Object.defineProperty(exports, "jsonSchemaValidator", { enumerable: true, get: function () { return JsonSchemaValidator_1.jsonSchemaValidator; } });
diff --git a/dist/js/validator/rules/equalTo.d.ts b/dist/js/validator/rules/equalTo.d.ts
new file mode 100644
index 00000000..c0f7a056
--- /dev/null
+++ b/dist/js/validator/rules/equalTo.d.ts
@@ -0,0 +1,2 @@
+import Ajv from "ajv";
+export default function addEqualToFieldKeyword(ajv: Ajv): void;
diff --git a/dist/js/validator/rules/equalTo.js b/dist/js/validator/rules/equalTo.js
new file mode 100644
index 00000000..9eea62df
--- /dev/null
+++ b/dist/js/validator/rules/equalTo.js
@@ -0,0 +1,18 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.default = addEqualToFieldKeyword;
+function addEqualToFieldKeyword(ajv) {
+    ajv.addKeyword({
+        keyword: "equalToField",
+        type: "string", // Applies to string fields
+        schemaType: "string", // The schema for this keyword should be a string (field name)
+        validate(schema, data, _parentSchema, dataCxt) {
+            const otherFieldValue = dataCxt === null || dataCxt === void 0 ? void 0 : dataCxt.parentData[schema];
+            return data === otherFieldValue;
+        },
+        errors: true, // Enable error handling
+        error: {
+            message: (cxt) => `should be equal to the value of "${cxt.schema}"`,
+        },
+    });
+}
diff --git a/dist/js/validator/rules/index.d.ts b/dist/js/validator/rules/index.d.ts
new file mode 100644
index 00000000..dfbc5056
--- /dev/null
+++ b/dist/js/validator/rules/index.d.ts
@@ -0,0 +1,6 @@
+import type Ajv from "ajv";
+/**
+ * Shared AJV formats/keywords for the standalone validator.
+ * App-specific formats (password, phone, username, email) are registered by the host.
+ */
+export default function addSharedFormatsAndKeywords(ajv: Ajv): void;
diff --git a/dist/js/validator/rules/index.js b/dist/js/validator/rules/index.js
new file mode 100644
index 00000000..db61979c
--- /dev/null
+++ b/dist/js/validator/rules/index.js
@@ -0,0 +1,18 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.default = addSharedFormatsAndKeywords;
+const jsonSchemaToTypescriptKeywords_1 = __importDefault(require("@mat3ra/esse/dist/js/utils/ajvKeywords/jsonSchemaToTypescriptKeywords"));
+const equalTo_1 = __importDefault(require("./equalTo"));
+const isoDate_1 = __importDefault(require("./isoDate"));
+/**
+ * Shared AJV formats/keywords for the standalone validator.
+ * App-specific formats (password, phone, username, email) are registered by the host.
+ */
+function addSharedFormatsAndKeywords(ajv) {
+    (0, jsonSchemaToTypescriptKeywords_1.default)(ajv);
+    (0, equalTo_1.default)(ajv);
+    (0, isoDate_1.default)(ajv);
+}
diff --git a/dist/js/validator/rules/isoDate.d.ts b/dist/js/validator/rules/isoDate.d.ts
new file mode 100644
index 00000000..3f41672e
--- /dev/null
+++ b/dist/js/validator/rules/isoDate.d.ts
@@ -0,0 +1,2 @@
+import Ajv from "ajv";
+export default function addIsoDateKeyword(ajv: Ajv): void;
diff --git a/dist/js/validator/rules/isoDate.js b/dist/js/validator/rules/isoDate.js
new file mode 100644
index 00000000..58fcabc4
--- /dev/null
+++ b/dist/js/validator/rules/isoDate.js
@@ -0,0 +1,28 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.default = addIsoDateKeyword;
+function addIsoDateKeyword(ajv) {
+    ajv.addKeyword({
+        keyword: "isoDate",
+        type: "string",
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        validate(_schema, data, _parentSchema, dataCxt) {
+            if (data === null || typeof data === "undefined") {
+                return true;
+            }
+            if (typeof data !== "string") {
+                return false;
+            }
+            const isValid = !Number.isNaN(Date.parse(data));
+            if (isValid && dataCxt) {
+                dataCxt.parentData[dataCxt.parentDataProperty] = new Date(data);
+            }
+            return isValid;
+        },
+        errors: false,
+        modifying: true,
+        metaSchema: {
+            type: "boolean",
+        },
+    });
+}
diff --git a/dist/js/validator/types.d.ts b/dist/js/validator/types.d.ts
new file mode 100644
index 00000000..37633a2b
--- /dev/null
+++ b/dist/js/validator/types.d.ts
@@ -0,0 +1,5 @@
+import type { SchemaObject } from "ajv";
+export type ValidationSchema = SchemaObject & {
+    $id: string;
+};
+export type AnyObject = Record<string, any>;
diff --git a/dist/js/validator/types.js b/dist/js/validator/types.js
new file mode 100644
index 00000000..c8ad2e54
--- /dev/null
+++ b/dist/js/validator/types.js
@@ -0,0 +1,2 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
diff --git a/package-lock.json b/package-lock.json
index 98966b76..5d935756 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,9 +10,14 @@
             "license": "Apache-2.0",
             "dependencies": {
                 "@types/mathjs": "^5.0.1",
+                "ajv": "^8.20.0",
+                "ajv-formats": "^2.1.1",
+                "ajv-keywords": "^5.1.0",
                 "crypto-js": "^4.2.0",
                 "js-yaml": "^4.1.0",
+                "json-pointer": "^0.6.2",
                 "json-schema": "^0.4.0",
+                "json-schema-merge-allof": "^0.8.1",
                 "lodash": "^4.17.*",
                 "mathjs": "^5.10.3",
                 "mixwith": "^0.1.1",
@@ -33,12 +38,14 @@
                 "@babel/register": "^7.25.7",
                 "@babel/runtime-corejs3": "^7.25.7",
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@@ -2547,6 +2589,13 @@
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             "resolved": "https://registry.npmjs.org/json-schema/-/json-schema-0.4.0.tgz",
@@ -7523,7 +7563,6 @@
             "version": "0.2.2",
             "resolved": "https://registry.npmjs.org/json-schema-compare/-/json-schema-compare-0.2.2.tgz",
             "integrity": "sha512-c4WYmDKyJXhs7WWvAWm3uIYnfyWFoIp+JEoX34rctVvEkMYCPGhXtvmFFXiffBbxfZsvQ0RNnV5H7GvDF5HCqQ==",
-            "dev": true,
             "dependencies": {
                 "lodash": "^4.17.4"
             }
@@ -7551,7 +7590,7 @@
             "version": "0.8.1",
             "resolved": "https://registry.npmjs.org/json-schema-merge-allof/-/json-schema-merge-allof-0.8.1.tgz",
             "integrity": "sha512-CTUKmIlPJbsWfzRRnOXz+0MjIqvnleIXwFTzz+t9T86HnYX/Rozria6ZVGLktAU9e+NygNljveP+yxqtQp/Q4w==",
-            "dev": true,
+            "license": "MIT",
             "dependencies": {
                 "compute-lcm": "^1.1.2",
                 "json-schema-compare": "^0.2.2",
@@ -7602,10 +7641,10 @@
             }
         },
         "node_modules/json-schema-traverse": {
-            "version": "0.4.1",
-            "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
-            "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
-            "dev": true
+            "version": "1.0.0",
+            "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
+            "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
+            "license": "MIT"
         },
         "node_modules/json-stable-stringify-without-jsonify": {
             "version": "1.0.1",
@@ -8421,7 +8460,7 @@
             "version": "3.0.0",
             "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",
             "integrity": "sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==",
-            "devOptional": true,
+            "dev": true,
             "engines": {
                 "node": ">=0.10.0"
             }
@@ -9068,7 +9107,7 @@
             "version": "2.3.1",
             "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
             "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
-            "devOptional": true,
+            "dev": true,
             "engines": {
                 "node": ">=8.6"
             },
@@ -9200,6 +9239,7 @@
             "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
             "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
             "dev": true,
+            "license": "MIT",
             "engines": {
                 "node": ">=6"
             }
@@ -9243,7 +9283,7 @@
             "version": "3.6.0",
             "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.6.0.tgz",
             "integrity": "sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==",
-            "devOptional": true,
+            "dev": true,
             "dependencies": {
                 "picomatch": "^2.2.1"
             },
@@ -9392,7 +9432,6 @@
             "version": "2.0.2",
             "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
             "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
-            "dev": true,
             "engines": {
                 "node": ">=0.10.0"
             }
@@ -10108,28 +10147,6 @@
                 "node": ">=10.0.0"
             }
         },
-        "node_modules/table/node_modules/ajv": {
-            "version": "8.17.1",
-            "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.17.1.tgz",
-            "integrity": "sha512-B/gBuNg5SiMTrPkC+A2+cW0RszwxYmn6VYxB/inlBStS5nx6xHIt/ehKRhIMhqusl7a8LjQoZnjCs5vhwxOQ1g==",
-            "dev": true,
-            "dependencies": {
-                "fast-deep-equal": "^3.1.3",
-                "fast-uri": "^3.0.1",
-                "json-schema-traverse": "^1.0.0",
-                "require-from-string": "^2.0.2"
-            },
-            "funding": {
-                "type": "github",
-                "url": "https://github.com/sponsors/epoberezkin"
-            }
-        },
-        "node_modules/table/node_modules/json-schema-traverse": {
-            "version": "1.0.0",
-            "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
-            "integrity": "sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==",
-            "dev": true
-        },
         "node_modules/test-exclude": {
             "version": "6.0.0",
             "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -10213,7 +10230,7 @@
             "version": "5.0.1",
             "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
             "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
-            "devOptional": true,
+            "dev": true,
             "dependencies": {
                 "is-number": "^7.0.0"
             },
@@ -10622,6 +10639,7 @@
             "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
             "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
             "dev": true,
+            "license": "BSD-2-Clause",
             "dependencies": {
                 "punycode": "^2.1.0"
             }
@@ -10660,20 +10678,17 @@
         "node_modules/validate.io-array": {
             "version": "1.0.6",
             "resolved": "https://registry.npmjs.org/validate.io-array/-/validate.io-array-1.0.6.tgz",
-            "integrity": "sha512-DeOy7CnPEziggrOO5CZhVKJw6S3Yi7e9e65R1Nl/RTN1vTQKnzjfvks0/8kQ40FP/dsjRAOd4hxmJ7uLa6vxkg==",
-            "dev": true
+            "integrity": "sha512-DeOy7CnPEziggrOO5CZhVKJw6S3Yi7e9e65R1Nl/RTN1vTQKnzjfvks0/8kQ40FP/dsjRAOd4hxmJ7uLa6vxkg=="
         },
         "node_modules/validate.io-function": {
             "version": "1.0.2",
             "resolved": "https://registry.npmjs.org/validate.io-function/-/validate.io-function-1.0.2.tgz",
-            "integrity": "sha512-LlFybRJEriSuBnUhQyG5bwglhh50EpTL2ul23MPIuR1odjO7XaMLFV8vHGwp7AZciFxtYOeiSCT5st+XSPONiQ==",
-            "dev": true
+            "integrity": "sha512-LlFybRJEriSuBnUhQyG5bwglhh50EpTL2ul23MPIuR1odjO7XaMLFV8vHGwp7AZciFxtYOeiSCT5st+XSPONiQ=="
         },
         "node_modules/validate.io-integer": {
             "version": "1.0.5",
             "resolved": "https://registry.npmjs.org/validate.io-integer/-/validate.io-integer-1.0.5.tgz",
             "integrity": "sha512-22izsYSLojN/P6bppBqhgUDjCkr5RY2jd+N2a3DCAUey8ydvrZ/OkGvFPR7qfOpwR2LC5p4Ngzxz36g5Vgr/hQ==",
-            "dev": true,
             "dependencies": {
                 "validate.io-number": "^1.0.3"
             }
@@ -10682,7 +10697,6 @@
             "version": "1.0.0",
             "resolved": "https://registry.npmjs.org/validate.io-integer-array/-/validate.io-integer-array-1.0.0.tgz",
             "integrity": "sha512-mTrMk/1ytQHtCY0oNO3dztafHYyGU88KL+jRxWuzfOmQb+4qqnWmI+gykvGp8usKZOM0H7keJHEbRaFiYA0VrA==",
-            "dev": true,
             "dependencies": {
                 "validate.io-array": "^1.0.3",
                 "validate.io-integer": "^1.0.4"
@@ -10691,8 +10705,7 @@
         "node_modules/validate.io-number": {
             "version": "1.0.3",
             "resolved": "https://registry.npmjs.org/validate.io-number/-/validate.io-number-1.0.3.tgz",
-            "integrity": "sha512-kRAyotcbNaSYoDnXvb4MHg/0a1egJdLwS6oJ38TJY7aw9n93Fl/3blIXdyYvPOp55CNxywooG/3BcrwNrBpcSg==",
-            "dev": true
+            "integrity": "sha512-kRAyotcbNaSYoDnXvb4MHg/0a1egJdLwS6oJ38TJY7aw9n93Fl/3blIXdyYvPOp55CNxywooG/3BcrwNrBpcSg=="
         },
         "node_modules/which": {
             "version": "2.0.2",
diff --git a/package.json b/package.json
index 4a175666..d2c6037b 100644
--- a/package.json
+++ b/package.json
@@ -31,9 +31,15 @@
     "license": "Apache-2.0",
     "homepage": "https://github.com/Exabyte-io/code.js",
     "dependencies": {
+        "@types/mathjs": "^5.0.1",
+        "ajv": "^8.20.0",
+        "ajv-formats": "^2.1.1",
+        "ajv-keywords": "^5.1.0",
         "crypto-js": "^4.2.0",
         "js-yaml": "^4.1.0",
+        "json-pointer": "^0.6.2",
         "json-schema": "^0.4.0",
+        "json-schema-merge-allof": "^0.8.1",
         "lodash": "^4.17.*",
         "mathjs": "^5.10.3",
         "mixwith": "^0.1.1",
@@ -41,8 +47,7 @@
         "semver": "^7.6.3",
         "underscore": "^1.13.7",
         "underscore.string": "^3.3.6",
-        "uuid": "8.3.2",
-        "@types/mathjs": "^5.0.1"
+        "uuid": "8.3.2"
     },
     "devDependencies": {
         "@babel/cli": "^7.25.7",
@@ -55,12 +60,14 @@
         "@babel/register": "^7.25.7",
         "@babel/runtime-corejs3": "^7.25.7",
         "@exabyte-io/eslint-config": "^2025.1.15-0",
-        "@mat3ra/esse": "2026.5.27-0",
+        "@mat3ra/esse": "https://github.com/mat3ra/esse/tarball/13eb236299a2d5f3a43e75d1fe9e121deb674c0e",
         "@mat3ra/tsconfig": "2024.6.3-0",
         "@types/chai": "^4.3.20",
         "@types/crypto-js": "^4.2.2",
         "@types/js-yaml": "^4.0.9",
+        "@types/json-pointer": "^1.0.34",
         "@types/json-schema": "^7.0.15",
+        "@types/json-schema-merge-allof": "^0.6.5",
         "@types/mocha": "^10.0.8",
         "@types/node": "^20.16.10",
         "@types/underscore": "^1.11.15",
diff --git a/scripts/generate-mixins.ts b/scripts/generate-mixins.ts
index 0108f2fc..45a848f0 100644
--- a/scripts/generate-mixins.ts
+++ b/scripts/generate-mixins.ts
@@ -24,6 +24,8 @@ const SKIP_FIELDS: string[] = [];
  * Output file paths for each schema
  */
 const OUTPUT_PATHS = {
+    "system/hashed": "src/js/generated/HashedSchemaMixin.ts",
+    "system/bankable": "src/js/generated/BankableSchemaMixin.ts",
     "system/defaultable": "src/js/generated/DefaultableSchemaMixin.ts",
     "system/has-consistency-check": "src/js/generated/HasConsistencyChecksSchemaMixin.ts",
     "system/description": "src/js/generated/HasDescriptionSchemaMixin.ts",
diff --git a/src/js/entity/in_memory.ts b/src/js/entity/in_memory.ts
index c4d3065a..400172f4 100644
--- a/src/js/entity/in_memory.ts
+++ b/src/js/entity/in_memory.ts
@@ -16,7 +16,7 @@ export enum ValidationErrorCode {
 
 interface ErrorDetails {
     error?: object | null;
-    json: AnyObject;
+    json: object;
     schema: JSONSchema;
 }
 
@@ -32,9 +32,11 @@ export class EntityError extends Error {
     }
 }
 
-export class InMemoryEntity implements BaseInMemoryEntitySchema {
-    static create(config: object) {
-        return new (this.prototype.constructor as typeof InMemoryEntity)(config);
+type Schema = BaseInMemoryEntitySchema;
+
+export class InMemoryEntity<S extends Schema = Schema> implements Schema {
+    static create<T extends InMemoryEntity<Schema>>(config: Schema): T {
+        return new (this.prototype.constructor as InMemoryEntityConstructor<T>)(config);
     }
 
     // Override if deepClone of config is required
@@ -44,35 +46,32 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
 
     static readonly jsonSchema?: JSONSchema;
 
-    _json: AnyObject = {};
+    _json: S;
 
-    constructor(config: object | InMemoryEntity = {}) {
-        if (config instanceof InMemoryEntity) {
-            this._json = config.toJSON();
-        } else {
-            this._json = (this.constructor as typeof InMemoryEntity)._isDeepCloneRequired
-                ? deepClone(config)
-                : clone(config);
-        }
+    // NoInfer: keep default S (or an explicit type arg) instead of inferring S from the config literal.
+    constructor(config: NoInfer<S>) {
+        this._json = (this.constructor as typeof InMemoryEntity)._isDeepCloneRequired
+            ? deepClone(config)
+            : clone(config);
     }
 
-    prop<T = undefined>(name: string, defaultValue: T): T;
+    prop<K extends keyof S>(name: K, defaultValue: S[K]): S[K];
 
-    prop<T = undefined>(name: string): T | undefined;
+    prop<K extends keyof S>(name: K): S[K] | undefined;
 
     /**
      * @summary Return a prop or the default
      */
-    prop<T = undefined>(name: string, defaultValue?: T): T | undefined {
-        // `lodash.get` gets `null` when the value is `null`, but we still want a default value in this case, hence `||`
-        return (getValue(this._json, name, defaultValue) as T) ?? defaultValue;
+    prop<K extends keyof S>(name: K, defaultValue?: S[K]): S[K] | undefined {
+        // `lodash.get` gets `null` when the value is `null`, but we still want a default value in this case, hence `??`
+        return (getValue(this._json, name, defaultValue) as S[K] | undefined) ?? defaultValue;
     }
 
     /**
      * @summary Return a required prop, throwing an error if it doesn't exist or is undefined/null
      */
-    requiredProp<T>(name: string): T {
-        const value = this.prop<T>(name);
+    requiredProp<K extends keyof S>(name: K): S[K] {
+        const value = this.prop(name);
         if (value === undefined || value === null) {
             throw new EntityError({
                 code: ValidationErrorCode.REQUIRED_PROPERTY_MISSING,
@@ -89,7 +88,7 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
     /**
      * @summary Set a prop
      */
-    setProp(name: string, value: unknown) {
+    setProp(name: keyof S, value: S[typeof name]) {
         // lodash.set is required to support dot-notation in keys (e.g. "compute.cluster.fqdn")
         set(this._json, name, value);
     }
@@ -97,7 +96,7 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
     /**
      * @summary Remove a prop
      */
-    unsetProp(name: string) {
+    unsetProp(name: keyof S) {
         delete this._json[name];
     }
 
@@ -105,26 +104,35 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
      * Updates internal JSON. Works the same as Mongo's $set operator
      * @see https://www.mongodb.com/docs/manual/reference/operator/update/set/#-set
      */
-    setProps(json: AnyObject = {}) {
-        Object.entries(json).forEach(([key, value]) => this.setProp(key, value));
+    setProps(json: Partial<S> = {}) {
+        Object.entries(json).forEach(([key, value]) => {
+            const keyType = key as keyof S;
+            this.setProp(keyType, value as S[typeof keyType]);
+        });
         return this;
     }
 
     /**
-     * @summary Array of fields to exclude from resulted JSON
+     * @summary Array of fields to exclude from resulted JSON.
+     * JSON.stringify calls `toJSON(key)` with the parent property name (a string).
+     * Only an actual array is treated as an omit list — otherwise stringify would
+     * strip fields whose names match the property key (e.g. systemTeams.owner).
      */
-    toJSON(exclude: string[] = []) {
+    toJSON(exclude: (keyof S)[] = []): S {
+        const omitKeys = Array.isArray(exclude) ? exclude : [];
         return (this.constructor as typeof InMemoryEntity)._isDeepCloneRequired
-            ? this.toJSONSafe(exclude)
-            : this.toJSONQuick(exclude);
+            ? this.toJSONSafe(omitKeys)
+            : this.toJSONQuick(omitKeys);
     }
 
-    toJSONSafe(exclude: string[] = []): AnyObject {
-        return this.clean(deepClone(omit(this._json, exclude)));
+    toJSONSafe(exclude: (keyof S)[] = []): S {
+        const omitKeys = Array.isArray(exclude) ? exclude : [];
+        return this.clean(deepClone(omit(this._json, omitKeys)));
     }
 
-    toJSONQuick(exclude: string[] = []): AnyObject {
-        return this.clean(clone(omit(this._json, exclude)));
+    toJSONQuick(exclude: (keyof S)[] = []): S {
+        const omitKeys = Array.isArray(exclude) ? exclude : [];
+        return this.clean(clone(omit(this._json, omitKeys)));
     }
 
     /**
@@ -140,15 +148,15 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
         });
     }
 
-    static validateData(data: AnyObject, clean = false, jsonSchema = this.jsonSchema) {
+    static validateData(data: object, clean = false, jsonSchema = this.jsonSchema) {
         if (!jsonSchema) {
             return data;
         }
         const result = clean
-            ? ajv.validateAndClean(data, jsonSchema, {
+            ? ajv.validateAndClean(data as AnyObject, jsonSchema, {
                   coerceTypes: this.allowJsonSchemaTypesCoercing,
               })
-            : ajv.validate(data, jsonSchema);
+            : ajv.validate(data as AnyObject, jsonSchema);
 
         if (!result.isValid) {
             throw new EntityError({
@@ -173,9 +181,9 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
         }
     }
 
-    clean(config: AnyObject) {
+    clean(config: S) {
         try {
-            return (this.constructor as typeof InMemoryEntity).validateData(config, true);
+            return (this.constructor as typeof InMemoryEntity).validateData(config, true) as S;
         } catch (err) {
             if (err instanceof EntityError) {
                 console.error({
@@ -216,12 +224,14 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
      * @param byIdOnly if true, return only the id
      * @returns identifying data
      */
-    getAsEntityReference(byIdOnly: true): { _id: string };
+    getAsEntityReference(byIdOnly: true): { _id: NonNullable<S["_id"]> };
 
-    getAsEntityReference(byIdOnly?: false): Required<EntityReferenceSchema>;
+    getAsEntityReference(byIdOnly?: false): EntityReferenceSchema & { _id: string; cls: string };
 
     getAsEntityReference(byIdOnly = false) {
-        if (!this.id) {
+        // Slug is usually present on entity references, but not required for all entities
+        // (e.g. workflows are not slugified). Only `_id` is required to form a reference.
+        if (!this._id) {
             throw new EntityError({
                 code: ValidationErrorCode.ENTITY_REFERENCE_ERROR,
                 details: {
@@ -232,74 +242,52 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
         }
 
         if (byIdOnly) {
-            return { _id: this.id };
+            return { _id: this._id };
         }
 
         return {
-            _id: this.id,
-            slug: this.slug,
+            _id: this._id,
+            ...(this.slug !== undefined ? { slug: this.slug } : {}),
             cls: this.getClsName(),
         };
     }
 
-    /**
-     * @summary Pluck an entity from a collection by name.
-     *          If no name is provided and no entity has prop isDefault, return the first entity
-     * @param entities the entities
-     * @param entity the kind of entities
-     * @param name the name of the entity to choose
-     */
-    // eslint-disable-next-line class-methods-use-this
-    getEntityByName(entities: InMemoryEntity[], entity: string, name: string) {
-        let filtered;
-        if (!name) {
-            filtered = entities.filter((ent) => ent.prop("isDefault") === true);
-            if (!filtered.length) filtered = [entities[0]];
-        } else {
-            filtered = entities.filter((ent) => ent.prop("name") === name);
-        }
-        if (filtered.length !== 1) {
-            console.log(`found ${filtered.length} entity ${entity} with name ${name} expected 1`);
-        }
-        return filtered[0];
-    }
-
     // Properties from BaseInMemoryEntitySchema
 
     get id() {
-        return this.prop("_id", "");
+        return this.prop("_id");
     }
 
-    set id(id) {
+    set id(id: S["_id"]) {
         this.setProp("_id", id);
     }
 
     get _id() {
-        return this.prop("_id", "");
+        return this.prop("_id");
     }
 
-    set _id(id) {
+    set _id(id: S["_id"]) {
         this.setProp("_id", id);
     }
 
     get schemaVersion() {
-        return this.prop("schemaVersion", "");
+        return this.prop("schemaVersion");
     }
 
-    set schemaVersion(schemaVersion) {
+    set schemaVersion(schemaVersion: S["schemaVersion"]) {
         this.setProp("schemaVersion", schemaVersion);
     }
 
     get systemName() {
-        return this.prop("systemName", "");
+        return this.prop("systemName");
     }
 
-    set systemName(systemName) {
+    set systemName(systemName: S["systemName"]) {
         this.setProp("systemName", systemName);
     }
 
     get slug() {
-        return this.prop("slug", "");
+        return this.prop("slug");
     }
 
     get isSystemEntity() {
diff --git a/src/js/entity/index.ts b/src/js/entity/index.ts
index 4a5bee5e..425ab4c8 100644
--- a/src/js/entity/index.ts
+++ b/src/js/entity/index.ts
@@ -7,7 +7,6 @@ import {
     NamedInMemoryEntity,
 } from "./other";
 import { ENTITY_SET_TYPES } from "./set/enums";
-import { constructEntitySetFactoryByConfig } from "./set/factory";
 import { InMemoryEntitySetMixin } from "./set/mixins";
 import { orderedEntityInSetMixin, orderedEntitySetMixin } from "./set/ordered/mixins";
 import * as selectorsForEntitySet from "./set/selectors";
@@ -20,7 +19,6 @@ export {
     HasMetadataNamedDefaultableInMemoryEntity,
     HasConsistencyChecksHasMetadataNamedDefaultableInMemoryEntity,
     ENTITY_SET_TYPES,
-    constructEntitySetFactoryByConfig,
     selectorsForEntitySet,
     InMemoryEntitySetMixin,
     orderedEntitySetMixin,
diff --git a/src/js/entity/mixins/BankableEntityMixin.ts b/src/js/entity/mixins/BankableEntityMixin.ts
new file mode 100644
index 00000000..1e1e5c2b
--- /dev/null
+++ b/src/js/entity/mixins/BankableEntityMixin.ts
@@ -0,0 +1,15 @@
+import { type BankableSchemaMixin, bankableSchemaMixin } from "../../generated/BankableSchemaMixin";
+import type { Constructor } from "../../utils/types";
+import { InMemoryEntity } from "../in_memory";
+import { type HashedEntity, hashedEntityMixin } from "./HashedEntityMixin";
+
+export type BankableEntity = BankableSchemaMixin & HashedEntity;
+
+export type BankableInMemoryEntityConstructor = Constructor<BankableEntity>;
+
+export function bankableEntityMixin<T extends InMemoryEntity>(
+    item: T,
+): asserts item is T & BankableEntity {
+    bankableSchemaMixin(item);
+    hashedEntityMixin(item);
+}
diff --git a/src/js/entity/mixins/HasConsistencyChecksMixin.ts b/src/js/entity/mixins/HasConsistencyChecksMixin.ts
index 99b8cf58..cf13558f 100644
--- a/src/js/entity/mixins/HasConsistencyChecksMixin.ts
+++ b/src/js/entity/mixins/HasConsistencyChecksMixin.ts
@@ -21,7 +21,7 @@ export function hasConsistencyChecksMixin<T extends InMemoryEntity>(
     hasConsistencyChecksSchemaMixin(item);
 
     // @ts-expect-error
-    const properties: InMemoryEntity & HasConsistencyChecks = {
+    const properties: InMemoryEntity<HasConsistencyChecksSchemaMixin> & HasConsistencyChecks = {
         addConsistencyChecks(array: ConsistencyCheck[]) {
             this.consistencyChecks = [...(this.consistencyChecks || []), ...array];
         },
diff --git a/src/js/entity/mixins/HasMetadataMixin.ts b/src/js/entity/mixins/HasMetadataMixin.ts
index 02cbaedc..3986ee53 100644
--- a/src/js/entity/mixins/HasMetadataMixin.ts
+++ b/src/js/entity/mixins/HasMetadataMixin.ts
@@ -5,9 +5,12 @@ import { InMemoryEntity } from "../in_memory";
 
 type Metadata = MetadataSchema["metadata"];
 
-export type HasMetadata<T extends Metadata = Metadata> = {
-    metadata?: T;
-    updateMetadata: (object: Partial<T>) => void;
+type HasMetadataSchema<M extends Metadata = Metadata> = {
+    metadata?: M;
+};
+
+export type HasMetadata<M extends Metadata = Metadata> = HasMetadataSchema<M> & {
+    updateMetadata: (object: M) => void;
 };
 
 export type HasMetadataInMemoryEntityConstructor<T extends Metadata = Metadata> = Constructor<
@@ -16,16 +19,16 @@ export type HasMetadataInMemoryEntityConstructor<T extends Metadata = Metadata>
 
 function hasMetadataPropertiesMixin<T extends InMemoryEntity, M extends Metadata = Metadata>(
     item: T,
-): asserts item is T & HasMetadata {
+): asserts item is T & HasMetadata<M> {
     // @ts-expect-error
-    const properties: InMemoryEntity & HasMetadata<M> = {
+    const properties: InMemoryEntity<HasMetadataSchema<M>> & HasMetadata<M> = {
         get metadata() {
-            return this.prop<M>("metadata");
+            return this.prop("metadata");
         },
         set metadata(value: M | undefined) {
             this.setProp("metadata", value);
         },
-        updateMetadata(object: Partial<M>) {
+        updateMetadata(object: M) {
             this.setProp("metadata", { ...this.metadata, ...object });
         },
     };
diff --git a/src/js/entity/mixins/HasScopeTrackMixin.ts b/src/js/entity/mixins/HasScopeTrackMixin.ts
index 12e1ec54..2b19b57b 100644
--- a/src/js/entity/mixins/HasScopeTrackMixin.ts
+++ b/src/js/entity/mixins/HasScopeTrackMixin.ts
@@ -1,5 +1,9 @@
 import { InMemoryEntity } from "../in_memory";
 
+type ScopeTrackSchema = {
+    scopeTrack?: unknown[];
+};
+
 type ScopeTrackDescriptor = {
     get scopeTrack(): unknown[];
     set scopeTrack(array: unknown[]);
@@ -7,9 +11,9 @@ type ScopeTrackDescriptor = {
 
 function schemaMixin(item: InMemoryEntity) {
     // @ts-expect-error
-    const properties: InMemoryEntity & ScopeTrackDescriptor = {
+    const properties: InMemoryEntity<ScopeTrackSchema> & ScopeTrackDescriptor = {
         get scopeTrack(): unknown[] {
-            return this.prop("scopeTrack", []);
+            return this.prop("scopeTrack") ?? [];
         },
         set scopeTrack(array: unknown[]) {
             this.setProp("scopeTrack", array);
diff --git a/src/js/entity/mixins/HashedEntityMixin.ts b/src/js/entity/mixins/HashedEntityMixin.ts
index 7aed5a06..8e2eb74c 100644
--- a/src/js/entity/mixins/HashedEntityMixin.ts
+++ b/src/js/entity/mixins/HashedEntityMixin.ts
@@ -1,8 +1,9 @@
+import { type HashedSchemaMixin, hashedSchemaMixin } from "../../generated/HashedSchemaMixin";
 import { calculateHashFromObject } from "../../utils/hash";
 import type { Constructor } from "../../utils/types";
 import { InMemoryEntity } from "../in_memory";
 
-export type HashedEntity = {
+export type HashedEntity = HashedSchemaMixin & {
     calculateHash(): string;
     getHashObject?(): object;
 };
@@ -12,8 +13,10 @@ export type HashedInMemoryEntityConstructor = Constructor<HashedEntity>;
 export function hashedEntityMixin<T extends InMemoryEntity>(
     item: T,
 ): asserts item is T & HashedEntity {
+    hashedSchemaMixin(item);
+
     // @ts-expect-error
-    const properties: InMemoryEntity & HashedEntity = {
+    const properties: InMemoryEntity & Pick<HashedEntity, "calculateHash" | "getHashObject"> = {
         /**
          * @summary Calculates hash based on meaningful fields and unit-specific fields. Unit-specific fields are
          *          separated into _typeSpecificHash function which can be overwritten by child classes.
diff --git a/src/js/entity/mixins/ImportantSettingsProviderMixin.ts b/src/js/entity/mixins/ImportantSettingsProviderMixin.ts
deleted file mode 100644
index 0ea00155..00000000
--- a/src/js/entity/mixins/ImportantSettingsProviderMixin.ts
+++ /dev/null
@@ -1,50 +0,0 @@
-import { deepClone } from "../../utils/clone";
-import type { Constructor } from "../../utils/types";
-import type { InMemoryEntity } from "../in_memory";
-
-export interface ContextProvider {
-    domain?: string;
-}
-
-export type ImportantSettingsProvider = {
-    important: object;
-    setImportant(key: string, value: unknown): void;
-    importantSettingsProviders: ContextProvider[];
-    isImportantEdited: boolean | undefined;
-};
-
-type AbstractBase = {
-    contextProviders: ContextProvider[];
-};
-
-export type ImportantSettingsProviderInMemoryEntityConstructor =
-    Constructor<ImportantSettingsProvider>;
-
-export function importantSettingsProviderMixin<T extends InMemoryEntity & AbstractBase>(
-    item: T,
-): asserts item is T & ImportantSettingsProvider {
-    // @ts-expect-error
-    const properties: InMemoryEntity & AbstractBase & ImportantSettingsProvider = {
-        get important() {
-            return deepClone(this._json.important || {});
-        },
-
-        setImportant(key: string, value: unknown) {
-            this.setProp("important", { [key]: value });
-        },
-
-        get importantSettingsProviders() {
-            return this.contextProviders.filter((p) => p.domain === "important");
-        },
-
-        get isImportantEdited() {
-            return this.prop<boolean>("important.isEdited");
-        },
-
-        set isImportantEdited(bool) {
-            this.setProp("important", Object.assign(this.important, { isEdited: bool }));
-        },
-    };
-
-    Object.defineProperties(item, Object.getOwnPropertyDescriptors(properties));
-}
diff --git a/src/js/entity/mixins/NamedEntityMixin.ts b/src/js/entity/mixins/NamedEntityMixin.ts
index e3e115b8..e6135099 100644
--- a/src/js/entity/mixins/NamedEntityMixin.ts
+++ b/src/js/entity/mixins/NamedEntityMixin.ts
@@ -17,7 +17,7 @@ function namedEntityPropertiesMixin<T extends InMemoryEntity>(
     item: T,
 ): asserts item is T & NamedEntity {
     // @ts-expect-error
-    const properties: InMemoryEntity & NamedEntity = {
+    const properties: InMemoryEntity<NamedEntitySchemaMixin> & NamedEntity = {
         setName(name: string) {
             this.setProp("name", name);
         },
diff --git a/src/js/entity/mixins/RuntimeItemsMixin.ts b/src/js/entity/mixins/RuntimeItemsMixin.ts
index 432acb33..5976327f 100644
--- a/src/js/entity/mixins/RuntimeItemsMixin.ts
+++ b/src/js/entity/mixins/RuntimeItemsMixin.ts
@@ -21,7 +21,7 @@ function runtimeItemsPropertiesMixin<T extends InMemoryEntity>(
     item: T,
 ): asserts item is T & RuntimeItems {
     // @ts-expect-error
-    const properties: InMemoryEntity & RuntimeItemsNameObject = {
+    const properties: InMemoryEntity<RuntimeItemsSchemaMixin> & RuntimeItems = {
         get hashObjectFromRuntimeItems() {
             return {
                 results: this.results,
diff --git a/src/js/entity/mixins/TaggableMixin.ts b/src/js/entity/mixins/TaggableMixin.ts
index 2d5effb5..ea5f0260 100644
--- a/src/js/entity/mixins/TaggableMixin.ts
+++ b/src/js/entity/mixins/TaggableMixin.ts
@@ -12,7 +12,7 @@ export type TaggableInMemoryEntityConstructor = Constructor<Taggable>;
 
 function taggablePropertiesMixin<T extends InMemoryEntity>(item: T): asserts item is T & Taggable {
     // @ts-expect-error
-    const properties: InMemoryEntity & Taggable = {
+    const properties: InMemoryEntity<TaggableSchemaMixin> & Taggable = {
         setTags(array: string[]) {
             this.tags = array.filter((value, index, self) => self.indexOf(value) === index);
         },
diff --git a/src/js/entity/set/InMemoryEntityInSetMixin.ts b/src/js/entity/set/InMemoryEntityInSetMixin.ts
index f9cd9d17..56b21e6c 100644
--- a/src/js/entity/set/InMemoryEntityInSetMixin.ts
+++ b/src/js/entity/set/InMemoryEntityInSetMixin.ts
@@ -13,7 +13,7 @@ export function inMemoryEntityInSetMixin<E extends InMemoryEntity>(
     inSetSchemaMixin<E>(item);
 
     // @ts-expect-error
-    const properties: InMemoryEntity & InMemoryEntityInSet = {
+    const properties: InMemoryEntity<SystemInSetSchema> & InMemoryEntityInSet = {
         getInSetFilteredByCls(cls: string) {
             return this.inSet.filter((ref) => ref.cls === cls);
         },
diff --git a/src/js/entity/set/InMemoryEntitySetBaseMixin.ts b/src/js/entity/set/InMemoryEntitySetBaseMixin.ts
index de1c0fa9..90153bf2 100644
--- a/src/js/entity/set/InMemoryEntitySetBaseMixin.ts
+++ b/src/js/entity/set/InMemoryEntitySetBaseMixin.ts
@@ -1,10 +1,16 @@
-import { type EntitySetSchema, SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
+import {
+    type BaseInMemoryEntitySchema,
+    type EntitySetSchema,
+    SystemInSetSchema,
+} from "@mat3ra/esse/dist/js/types";
 
 import { type InMemoryEntity } from "../in_memory";
 
 export type SystemInSet = Required<SystemInSetSchema>;
 export type InSet = SystemInSet["inSet"][0];
 
+type EntitySetEntitySchema = BaseInMemoryEntitySchema & EntitySetSchema;
+
 export enum EntitySetType {
     ordered = "ordered",
     unordered = "unordered",
@@ -12,7 +18,7 @@ export enum EntitySetType {
 
 function schemaMixin<E extends InMemoryEntity>(item: E) {
     // @ts-expect-error
-    const properties: InMemoryEntity & EntitySetSchema = {
+    const properties: InMemoryEntity<EntitySetEntitySchema> & EntitySetSchema = {
         get isEntitySet() {
             return this.prop("isEntitySet", false);
         },
@@ -22,7 +28,7 @@ function schemaMixin<E extends InMemoryEntity>(item: E) {
         },
 
         get entityCls() {
-            return this.prop<string | undefined>("entityCls");
+            return this.prop("entityCls");
         },
     };
 
@@ -39,7 +45,9 @@ function methodsMixin<E extends InMemoryEntity>(item: E & EntitySetSchema) {
     const originalCls = item.cls;
 
     // @ts-expect-error
-    const properties: InMemoryEntity & EntitySetSchema & EntitySetBaseMethodsDescriptor = {
+    const properties: InMemoryEntity<EntitySetEntitySchema> &
+        EntitySetSchema &
+        EntitySetBaseMethodsDescriptor = {
         get cls() {
             return this.entityCls || originalCls;
         },
@@ -54,12 +62,16 @@ function methodsMixin<E extends InMemoryEntity>(item: E & EntitySetSchema) {
     return properties;
 }
 
-export type InMemoryEntitySetBase = ReturnType<typeof schemaMixin> &
-    ReturnType<typeof methodsMixin>;
+/** Mixin shape only — safe to merge into schema-generic subclasses (no baked-in `_json`). */
+export type InMemoryEntitySetBaseMixin = EntitySetSchema & EntitySetBaseMethodsDescriptor;
+
+/** Instance type with default entity-set schema (includes `InMemoryEntity<_json>`). */
+export type InMemoryEntitySetBase = InMemoryEntity<EntitySetEntitySchema> &
+    InMemoryEntitySetBaseMixin;
 
 export function inMemoryEntitySetBaseMixin<T extends InMemoryEntity>(
     item: T,
-): asserts item is T & InMemoryEntitySetBase {
+): asserts item is T & InMemoryEntitySetBaseMixin {
     schemaMixin(item);
     methodsMixin(item as T & EntitySetSchema);
 }
diff --git a/src/js/entity/set/factory.ts b/src/js/entity/set/factory.ts
deleted file mode 100644
index f8bceb76..00000000
--- a/src/js/entity/set/factory.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import { AnyObject } from "@mat3ra/esse/dist/js/esse/types";
-import { EntitySetSchema } from "@mat3ra/esse/dist/js/types";
-
-import { InMemoryEntity } from "../in_memory";
-
-export const constructEntitySetFactoryByConfig =
-    ({ entitySetCls = InMemoryEntity }) =>
-    (config: AnyObject, entityCls: EntitySetSchema["entityCls"]) => {
-        const Cls = entitySetCls;
-        return new Cls({
-            ...config,
-            entityCls,
-        });
-    };
diff --git a/src/js/entity/set/ordered/OrderedInMemoryEntityInSetMixin.ts b/src/js/entity/set/ordered/OrderedInMemoryEntityInSetMixin.ts
index 779ef1ea..1f436bd4 100644
--- a/src/js/entity/set/ordered/OrderedInMemoryEntityInSetMixin.ts
+++ b/src/js/entity/set/ordered/OrderedInMemoryEntityInSetMixin.ts
@@ -1,3 +1,5 @@
+import { SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
+
 import { type InMemoryEntity } from "../../in_memory";
 import type { InMemoryEntityInSet } from "../InMemoryEntityInSetMixin";
 
@@ -9,7 +11,9 @@ export function orderedEntityInSetMixin<T extends InMemoryEntity & InMemoryEntit
     item: T,
 ): asserts item is T & OrderedInMemoryEntityInSet {
     // @ts-expect-error
-    const properties: InMemoryEntity & InMemoryEntityInSet & OrderedInMemoryEntityInSet = {
+    const properties: InMemoryEntity<SystemInSetSchema> &
+        InMemoryEntityInSet &
+        OrderedInMemoryEntityInSet = {
         getIndexByIdInOrderedSet(setId: string): number {
             const setData = this.inSet.find((s) => s._id === setId);
             return setData?.index || 0;
diff --git a/src/js/entity/set/ordered/OrderedInMemoryEntitySetMixin.ts b/src/js/entity/set/ordered/OrderedInMemoryEntitySetMixin.ts
index f3056d2e..c08e999a 100644
--- a/src/js/entity/set/ordered/OrderedInMemoryEntitySetMixin.ts
+++ b/src/js/entity/set/ordered/OrderedInMemoryEntitySetMixin.ts
@@ -1,7 +1,11 @@
+import { type BaseInMemoryEntitySchema, type EntitySetSchema } from "@mat3ra/esse/dist/js/types";
+
 import { type InMemoryEntity } from "../../in_memory";
 import { ENTITY_SET_TYPES } from "../enums";
 import type { InMemoryEntitySetBase } from "../InMemoryEntitySetBaseMixin";
 
+type EntitySetEntitySchema = BaseInMemoryEntitySchema & EntitySetSchema;
+
 export type OrderedInMemoryEntitySet = {
     get isOrderedSet(): boolean;
 };
@@ -10,7 +14,9 @@ export function orderedEntitySetMixin<T extends InMemoryEntity & InMemoryEntityS
     item: T,
 ): asserts item is T & OrderedInMemoryEntitySet {
     // @ts-expect-error
-    const properties: InMemoryEntity & InMemoryEntitySetBase & OrderedInMemoryEntitySet = {
+    const properties: InMemoryEntity<EntitySetEntitySchema> &
+        InMemoryEntitySetBase &
+        OrderedInMemoryEntitySet = {
         get isOrderedSet(): boolean {
             return this.entitySetType === ENTITY_SET_TYPES.ordered;
         },
diff --git a/src/js/generateSchemaMixin.ts b/src/js/generateSchemaMixin.ts
index a7447abe..aba2e25c 100644
--- a/src/js/generateSchemaMixin.ts
+++ b/src/js/generateSchemaMixin.ts
@@ -104,7 +104,7 @@ function generateMixinFunction(
     );
 
     let code = `import type { InMemoryEntity } from "${entityFrom}";\n`;
-    code += `import type { ${schemaName} } from "${from}";\n\n`;
+    code += `import type { BaseInMemoryEntitySchema, ${schemaName} } from "${from}";\n\n`;
 
     // Generate the mixin type - only use Omit if skipFields has values
     if (skipFields && skipFields.length > 0) {
@@ -114,14 +114,14 @@ function generateMixinFunction(
         code += `export type ${mixinTypeName} = ${schemaName};\n\n`;
     }
 
-    // Generate the entity type
-    code += `export type ${entityTypeName} = InMemoryEntity & ${mixinTypeName};\n\n`;
+    // Entity schema must include base fields so `_json` / `toJSON` stay compatible with InMemoryEntity
+    code += `export type ${entityTypeName} = InMemoryEntity<BaseInMemoryEntitySchema & ${mixinTypeName}>;\n\n`;
 
     code += `export function ${functionName}<T extends InMemoryEntity>(\n`;
     code += `    item: InMemoryEntity,\n`;
     code += `): asserts item is T & ${mixinTypeName} {\n`;
     code += `    // @ts-expect-error\n`;
-    code += `    const properties: InMemoryEntity & ${mixinTypeName} = {\n`;
+    code += `    const properties: InMemoryEntity<${mixinTypeName}> & ${mixinTypeName} = {\n`;
 
     for (let i = 0; i < propertyEntries.length; i++) {
         const [propertyName] = propertyEntries[i];
@@ -130,7 +130,7 @@ function generateMixinFunction(
         const typeAnnotation = generateTypeAnnotation(propertyName, schemaName);
 
         code += `get ${propertyName}() {\n`;
-        code += `return this.${methodName}<${typeAnnotation}>("${propertyName}");\n`;
+        code += `return this.${methodName}("${propertyName}");\n`;
         code += `},\n`;
         code += `set ${propertyName}(value: ${typeAnnotation}) {\n`;
         code += `this.setProp("${propertyName}", value);\n`;
diff --git a/src/js/generated/BankableSchemaMixin.ts b/src/js/generated/BankableSchemaMixin.ts
new file mode 100644
index 00000000..f6d6449b
--- /dev/null
+++ b/src/js/generated/BankableSchemaMixin.ts
@@ -0,0 +1,23 @@
+import type { BankableSchema, BaseInMemoryEntitySchema } from "@mat3ra/esse/dist/js/types";
+
+import type { InMemoryEntity } from "../entity/in_memory";
+
+export type BankableSchemaMixin = BankableSchema;
+
+export type BankableInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & BankableSchemaMixin>;
+
+export function bankableSchemaMixin<T extends InMemoryEntity>(
+    item: InMemoryEntity,
+): asserts item is T & BankableSchemaMixin {
+    // @ts-expect-error
+    const properties: InMemoryEntity<BankableSchemaMixin> & BankableSchemaMixin = {
+        get exabyteId() {
+            return this.requiredProp("exabyteId");
+        },
+        set exabyteId(value: BankableSchema["exabyteId"]) {
+            this.setProp("exabyteId", value);
+        },
+    };
+
+    Object.defineProperties(item, Object.getOwnPropertyDescriptors(properties));
+}
diff --git a/src/js/generated/DefaultableSchemaMixin.ts b/src/js/generated/DefaultableSchemaMixin.ts
index cfde55d1..5a320e88 100644
--- a/src/js/generated/DefaultableSchemaMixin.ts
+++ b/src/js/generated/DefaultableSchemaMixin.ts
@@ -1,18 +1,20 @@
-import type { DefaultableEntitySchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, DefaultableEntitySchema } from "@mat3ra/esse/dist/js/types";
 
 import type { InMemoryEntity } from "../entity/in_memory";
 
 export type DefaultableSchemaMixin = DefaultableEntitySchema;
 
-export type DefaultableInMemoryEntity = InMemoryEntity & DefaultableSchemaMixin;
+export type DefaultableInMemoryEntity = InMemoryEntity<
+    BaseInMemoryEntitySchema & DefaultableSchemaMixin
+>;
 
 export function defaultableSchemaMixin<T extends InMemoryEntity>(
     item: InMemoryEntity,
 ): asserts item is T & DefaultableSchemaMixin {
     // @ts-expect-error
-    const properties: InMemoryEntity & DefaultableSchemaMixin = {
+    const properties: InMemoryEntity<DefaultableSchemaMixin> & DefaultableSchemaMixin = {
         get isDefault() {
-            return this.prop<DefaultableEntitySchema["isDefault"]>("isDefault");
+            return this.prop("isDefault");
         },
         set isDefault(value: DefaultableEntitySchema["isDefault"]) {
             this.setProp("isDefault", value);
diff --git a/src/js/generated/HasConsistencyChecksSchemaMixin.ts b/src/js/generated/HasConsistencyChecksSchemaMixin.ts
index 34b9636b..8e7d8162 100644
--- a/src/js/generated/HasConsistencyChecksSchemaMixin.ts
+++ b/src/js/generated/HasConsistencyChecksSchemaMixin.ts
@@ -1,21 +1,24 @@
-import type { HasConsistencyCheckSchema } from "@mat3ra/esse/dist/js/types";
+import type {
+    BaseInMemoryEntitySchema,
+    HasConsistencyCheckSchema,
+} from "@mat3ra/esse/dist/js/types";
 
 import type { InMemoryEntity } from "../entity/in_memory";
 
 export type HasConsistencyChecksSchemaMixin = HasConsistencyCheckSchema;
 
-export type HasConsistencyChecksInMemoryEntity = InMemoryEntity & HasConsistencyChecksSchemaMixin;
+export type HasConsistencyChecksInMemoryEntity = InMemoryEntity<
+    BaseInMemoryEntitySchema & HasConsistencyChecksSchemaMixin
+>;
 
 export function hasConsistencyChecksSchemaMixin<T extends InMemoryEntity>(
     item: InMemoryEntity,
 ): asserts item is T & HasConsistencyChecksSchemaMixin {
     // @ts-expect-error
-    const properties: InMemoryEntity & HasConsistencyChecksSchemaMixin = {
+    const properties: InMemoryEntity<HasConsistencyChecksSchemaMixin> &
+        HasConsistencyChecksSchemaMixin = {
         get consistencyChecks() {
-            return this.prop<HasConsistencyCheckSchema["consistencyChecks"]>(
-                "consistencyChecks",
-                [],
-            );
+            return this.prop("consistencyChecks");
         },
         set consistencyChecks(value: HasConsistencyCheckSchema["consistencyChecks"]) {
             this.setProp("consistencyChecks", value);
diff --git a/src/js/generated/HasDescriptionSchemaMixin.ts b/src/js/generated/HasDescriptionSchemaMixin.ts
index 6fc6983f..cb4ec708 100644
--- a/src/js/generated/HasDescriptionSchemaMixin.ts
+++ b/src/js/generated/HasDescriptionSchemaMixin.ts
@@ -1,24 +1,26 @@
-import type { DescriptionSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, DescriptionSchema } from "@mat3ra/esse/dist/js/types";
 
 import type { InMemoryEntity } from "../entity/in_memory";
 
 export type HasDescriptionSchemaMixin = DescriptionSchema;
 
-export type HasDescriptionInMemoryEntity = InMemoryEntity & HasDescriptionSchemaMixin;
+export type HasDescriptionInMemoryEntity = InMemoryEntity<
+    BaseInMemoryEntitySchema & HasDescriptionSchemaMixin
+>;
 
 export function hasDescriptionSchemaMixin<T extends InMemoryEntity>(
     item: InMemoryEntity,
 ): asserts item is T & HasDescriptionSchemaMixin {
     // @ts-expect-error
-    const properties: InMemoryEntity & HasDescriptionSchemaMixin = {
+    const properties: InMemoryEntity<HasDescriptionSchemaMixin> & HasDescriptionSchemaMixin = {
         get description() {
-            return this.prop<DescriptionSchema["description"]>("description");
+            return this.prop("description");
         },
         set description(value: DescriptionSchema["description"]) {
             this.setProp("description", value);
         },
         get descriptionObject() {
-            return this.prop<DescriptionSchema["descriptionObject"]>("descriptionObject");
+            return this.prop("descriptionObject");
         },
         set descriptionObject(value: DescriptionSchema["descriptionObject"]) {
             this.setProp("descriptionObject", value);
diff --git a/src/js/generated/HashedSchemaMixin.ts b/src/js/generated/HashedSchemaMixin.ts
new file mode 100644
index 00000000..f1e22e51
--- /dev/null
+++ b/src/js/generated/HashedSchemaMixin.ts
@@ -0,0 +1,23 @@
+import type { BaseInMemoryEntitySchema, HashedSchema } from "@mat3ra/esse/dist/js/types";
+
+import type { InMemoryEntity } from "../entity/in_memory";
+
+export type HashedSchemaMixin = HashedSchema;
+
+export type HashedInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & HashedSchemaMixin>;
+
+export function hashedSchemaMixin<T extends InMemoryEntity>(
+    item: InMemoryEntity,
+): asserts item is T & HashedSchemaMixin {
+    // @ts-expect-error
+    const properties: InMemoryEntity<HashedSchemaMixin> & HashedSchemaMixin = {
+        get hash() {
+            return this.requiredProp("hash");
+        },
+        set hash(value: HashedSchema["hash"]) {
+            this.setProp("hash", value);
+        },
+    };
+
+    Object.defineProperties(item, Object.getOwnPropertyDescriptors(properties));
+}
diff --git a/src/js/generated/InSetSchemaMixin.ts b/src/js/generated/InSetSchemaMixin.ts
index 40f37f4e..bc347587 100644
--- a/src/js/generated/InSetSchemaMixin.ts
+++ b/src/js/generated/InSetSchemaMixin.ts
@@ -1,18 +1,18 @@
-import type { SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, SystemInSetSchema } from "@mat3ra/esse/dist/js/types";
 
 import type { InMemoryEntity } from "../entity/in_memory";
 
 export type InSetSchemaMixin = SystemInSetSchema;
 
-export type InSetInMemoryEntity = InMemoryEntity & InSetSchemaMixin;
+export type InSetInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & InSetSchemaMixin>;
 
 export function inSetSchemaMixin<T extends InMemoryEntity>(
     item: InMemoryEntity,
 ): asserts item is T & InSetSchemaMixin {
     // @ts-expect-error
-    const properties: InMemoryEntity & InSetSchemaMixin = {
+    const properties: InMemoryEntity<InSetSchemaMixin> & InSetSchemaMixin = {
         get inSet() {
-            return this.requiredProp<SystemInSetSchema["inSet"]>("inSet");
+            return this.requiredProp("inSet");
         },
         set inSet(value: SystemInSetSchema["inSet"]) {
             this.setProp("inSet", value);
diff --git a/src/js/generated/NamedEntitySchemaMixin.ts b/src/js/generated/NamedEntitySchemaMixin.ts
index 72744c2b..5730d633 100644
--- a/src/js/generated/NamedEntitySchemaMixin.ts
+++ b/src/js/generated/NamedEntitySchemaMixin.ts
@@ -1,18 +1,20 @@
-import type { NameEntitySchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, NameEntitySchema } from "@mat3ra/esse/dist/js/types";
 
 import type { InMemoryEntity } from "../entity/in_memory";
 
 export type NamedEntitySchemaMixin = NameEntitySchema;
 
-export type NamedEntityInMemoryEntity = InMemoryEntity & NamedEntitySchemaMixin;
+export type NamedEntityInMemoryEntity = InMemoryEntity<
+    BaseInMemoryEntitySchema & NamedEntitySchemaMixin
+>;
 
 export function namedEntitySchemaMixin<T extends InMemoryEntity>(
     item: InMemoryEntity,
 ): asserts item is T & NamedEntitySchemaMixin {
     // @ts-expect-error
-    const properties: InMemoryEntity & NamedEntitySchemaMixin = {
+    const properties: InMemoryEntity<NamedEntitySchemaMixin> & NamedEntitySchemaMixin = {
         get name() {
-            return this.requiredProp<NameEntitySchema["name"]>("name");
+            return this.requiredProp("name");
         },
         set name(value: NameEntitySchema["name"]) {
             this.setProp("name", value);
diff --git a/src/js/generated/RuntimeItemsSchemaMixin.ts b/src/js/generated/RuntimeItemsSchemaMixin.ts
index 4b16e484..3e5c4a95 100644
--- a/src/js/generated/RuntimeItemsSchemaMixin.ts
+++ b/src/js/generated/RuntimeItemsSchemaMixin.ts
@@ -1,36 +1,38 @@
-import type { RuntimeItemsSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, RuntimeItemsSchema } from "@mat3ra/esse/dist/js/types";
 
 import type { InMemoryEntity } from "../entity/in_memory";
 
 export type RuntimeItemsSchemaMixin = RuntimeItemsSchema;
 
-export type RuntimeItemsInMemoryEntity = InMemoryEntity & RuntimeItemsSchemaMixin;
+export type RuntimeItemsInMemoryEntity = InMemoryEntity<
+    BaseInMemoryEntitySchema & RuntimeItemsSchemaMixin
+>;
 
 export function runtimeItemsSchemaMixin<T extends InMemoryEntity>(
     item: InMemoryEntity,
 ): asserts item is T & RuntimeItemsSchemaMixin {
     // @ts-expect-error
-    const properties: InMemoryEntity & RuntimeItemsSchemaMixin = {
+    const properties: InMemoryEntity<RuntimeItemsSchemaMixin> & RuntimeItemsSchemaMixin = {
         get preProcessors() {
-            return this.requiredProp<RuntimeItemsSchema["preProcessors"]>("preProcessors");
+            return this.requiredProp("preProcessors");
         },
         set preProcessors(value: RuntimeItemsSchema["preProcessors"]) {
             this.setProp("preProcessors", value);
         },
         get postProcessors() {
-            return this.requiredProp<RuntimeItemsSchema["postProcessors"]>("postProcessors");
+            return this.requiredProp("postProcessors");
         },
         set postProcessors(value: RuntimeItemsSchema["postProcessors"]) {
             this.setProp("postProcessors", value);
         },
         get monitors() {
-            return this.requiredProp<RuntimeItemsSchema["monitors"]>("monitors");
+            return this.requiredProp("monitors");
         },
         set monitors(value: RuntimeItemsSchema["monitors"]) {
             this.setProp("monitors", value);
         },
         get results() {
-            return this.requiredProp<RuntimeItemsSchema["results"]>("results");
+            return this.requiredProp("results");
         },
         set results(value: RuntimeItemsSchema["results"]) {
             this.setProp("results", value);
diff --git a/src/js/generated/TaggableSchemaMixin.ts b/src/js/generated/TaggableSchemaMixin.ts
index 2c3fc837..b0efa328 100644
--- a/src/js/generated/TaggableSchemaMixin.ts
+++ b/src/js/generated/TaggableSchemaMixin.ts
@@ -1,18 +1,18 @@
-import type { EntityTagsSchema } from "@mat3ra/esse/dist/js/types";
+import type { BaseInMemoryEntitySchema, EntityTagsSchema } from "@mat3ra/esse/dist/js/types";
 
 import type { InMemoryEntity } from "../entity/in_memory";
 
 export type TaggableSchemaMixin = EntityTagsSchema;
 
-export type TaggableInMemoryEntity = InMemoryEntity & TaggableSchemaMixin;
+export type TaggableInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & TaggableSchemaMixin>;
 
 export function taggableSchemaMixin<T extends InMemoryEntity>(
     item: InMemoryEntity,
 ): asserts item is T & TaggableSchemaMixin {
     // @ts-expect-error
-    const properties: InMemoryEntity & TaggableSchemaMixin = {
+    const properties: InMemoryEntity<TaggableSchemaMixin> & TaggableSchemaMixin = {
         get tags() {
-            return this.prop<EntityTagsSchema["tags"]>("tags", []);
+            return this.prop("tags");
         },
         set tags(value: EntityTagsSchema["tags"]) {
             this.setProp("tags", value);
diff --git a/src/js/index.ts b/src/js/index.ts
index 0894b9f7..bf246765 100644
--- a/src/js/index.ts
+++ b/src/js/index.ts
@@ -2,6 +2,7 @@ import { ArrayWithIds, RoundedArrayWithIds } from "./ArrayWithIds";
 import * as context from "./context";
 import * as entity from "./entity";
 import * as utils from "./utils";
+import * as validator from "./validator";
 import { RoundedValueWithId, ValueWithId } from "./ValueWithId";
 import { RoundedVector3D, Vector3D } from "./vector";
 
@@ -13,7 +14,8 @@ export {
     RoundedVector3D,
     Vector3D,
 };
-export { entity, context, utils };
+export { entity, context, utils, validator };
+export { JsonSchemaValidator, jsonSchemaValidator } from "./validator";
 
 const Code = {
     ArrayWithIds,
@@ -25,6 +27,7 @@ const Code = {
     entity,
     context,
     utils,
+    validator,
 };
 
 export type CodeType = typeof Code;
diff --git a/src/js/utils/graph.ts b/src/js/utils/graph.ts
index 35ffde13..5f72abae 100644
--- a/src/js/utils/graph.ts
+++ b/src/js/utils/graph.ts
@@ -1,10 +1,8 @@
+import type { SubworkflowUnitSchema } from "@mat3ra/esse/dist/js/types";
+
 import { InMemoryEntity } from "../entity/in_memory";
 
-export type UnitEntity = InMemoryEntity & {
-    head: boolean;
-    next?: string;
-    flowchartId: string;
-};
+export type UnitEntity = SubworkflowUnitSchema & InMemoryEntity<SubworkflowUnitSchema>;
 
 /**
  * @summary Set the head of an array of units
diff --git a/src/js/validator/JsonSchemaValidator.ts b/src/js/validator/JsonSchemaValidator.ts
new file mode 100644
index 00000000..fdf74964
--- /dev/null
+++ b/src/js/validator/JsonSchemaValidator.ts
@@ -0,0 +1,285 @@
+/**
+ * Standalone AJV validator for cleaning and validating JSON against JSON Schema.
+ *
+ * Why this exists (alongside esse `utils/ajv`):
+ * - Compose schemas with `mergeAllOf` and enforce allowlists via `additionalProperties: false`
+ *   so callers can reject unknown / system-owned fields.
+ * - Optionally strip null / empty-string properties before type checks (see constructor options).
+ * - Map raw AJV errors into stable nested field → code objects (LIVR-style) for consumers that
+ *   need machine-readable validation results.
+ *
+ * Distinct from `@mat3ra/esse` `utils/ajv.validateAndClean` (entity clean: null-only strip used by
+ * `InMemoryEntity.toJSON*`). Prefer this class/API for application validation; register host
+ * formats with {@link JsonSchemaValidator.registerExtensions}.
+ */
+import { removeEmptyAndNullProperties } from "@mat3ra/esse/dist/js/utils/removeEmptyAndNullProperties";
+import Ajv, { ErrorObject } from "ajv";
+import { AnyValidateFunction } from "ajv/dist/core";
+import addFormats from "ajv-formats";
+import addKeywords from "ajv-keywords";
+import pointer from "json-pointer";
+import mergeAllOf from "json-schema-merge-allof";
+
+import addSharedFormatsAndKeywords from "./rules";
+import type { AnyObject, ValidationSchema } from "./types";
+
+type ErrorResult = {
+    [key: string]: string | ErrorResult;
+};
+
+export type JsonSchemaValidatorOptions = {
+    /**
+     * Delete object properties whose value is `null` before AJV (default: `true`).
+     * Nested objects are walked; array elements are not removed.
+     */
+    removeNull?: boolean;
+    /**
+     * Delete object properties whose value is `""` before AJV (default: `true`).
+     * Keep `false` when empty strings are intentional placeholders (e.g. flowchart links).
+     */
+    removeEmptyStrings?: boolean;
+};
+
+/**
+ * Recursively deletes empty-string object properties (mutates in place).
+ */
+function removeEmptyStringProperties(obj: AnyObject): AnyObject {
+    if (typeof obj !== "object" || obj === null) {
+        return obj;
+    }
+
+    if (Array.isArray(obj)) {
+        obj.forEach((item) => removeEmptyStringProperties(item));
+        return obj;
+    }
+
+    Object.keys(obj).forEach((key) => {
+        const value = obj[key];
+
+        if (value === "") {
+            delete obj[key];
+        } else if (typeof value === "object") {
+            removeEmptyStringProperties(value);
+        }
+    });
+
+    return obj;
+}
+
+export class JsonSchemaValidator {
+    private readonly ajv: Ajv;
+
+    private readonly removeNull: boolean;
+
+    private readonly removeEmptyStrings: boolean;
+
+    private readonly formatCodeMap: Record<string, string> = {
+        email: "WRONG_EMAIL",
+        "custom-email": "WRONG_EMAIL",
+        "custom-username": "WRONG_USERNAME",
+        "custom-phone": "WRONG_PHONE",
+        "custom-password": "WRONG_PASSWORD",
+    };
+
+    private readonly keywordsCodeMap: Record<string, string> = {
+        required: "REQUIRED",
+        type: "FORMAT_ERROR",
+        equalToField: "FIELDS_NOT_EQUAL",
+        minLength: "TOO_SHORT",
+        maxLength: "TOO_LONG",
+        isoDate: "WRONG_DATE",
+    };
+
+    constructor({ removeNull = true, removeEmptyStrings = true }: JsonSchemaValidatorOptions = {}) {
+        this.removeNull = removeNull;
+        this.removeEmptyStrings = removeEmptyStrings;
+
+        this.ajv = new Ajv({
+            allErrors: true,
+            useDefaults: true,
+            discriminator: true,
+            removeAdditional: true,
+            coerceTypes: true,
+            allowUnionTypes: true,
+            // Esse / workflow schemas: json-schema-to-typescript-only keywords, and `default` inside
+            // discriminated `oneOf` branches where Ajv still treats nested rules as composite (see
+            // assignDefault + compositeRule). strictSchema would fail compilation for those valid schemas.
+            strictSchema: false,
+        });
+
+        addFormats(this.ajv);
+        addKeywords(this.ajv);
+        addSharedFormatsAndKeywords(this.ajv);
+    }
+
+    /**
+     * Register host-specific AJV formats/keywords (e.g. web-app password/phone) on this instance.
+     */
+    registerExtensions(register: (ajvInstance: Ajv) => void): void {
+        register(this.ajv);
+    }
+
+    private getCompiledValidator(jsonSchema: ValidationSchema): AnyValidateFunction {
+        let validate = this.ajv.getSchema(jsonSchema.$id);
+
+        if (!validate) {
+            const schema = mergeAllOf(jsonSchema, { ignoreAdditionalProperties: true });
+            this.ajv.addSchema(schema, jsonSchema.$id);
+            validate = this.ajv.getSchema(jsonSchema.$id);
+        }
+
+        if (!validate) {
+            throw new Error("JSONSchemasInterface AJV validator error");
+        }
+
+        return validate;
+    }
+
+    /**
+     * Simplify AJV errors into LIVR-inspired field → code maps for API responses.
+     * Inspired by https://github.com/koorchik/LIVR
+     *
+     * @example of raw AJV errors:
+     * [
+     *     {
+     *         "instancePath": "",
+     *         "schemaPath": "#/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "intent"
+     *         },
+     *         "message": "must have required property 'intent'"
+     *     },
+     *     {
+     *         "instancePath": "/user",
+     *         "schemaPath": "#/properties/user/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "username"
+     *         },
+     *         "message": "must have required property 'username'"
+     *     },
+     *     {
+     *         "instancePath": "/user",
+     *         "schemaPath": "#/properties/user/required",
+     *         "keyword": "required",
+     *         "params": {
+     *             "missingProperty": "fullname"
+     *         },
+     *         "message": "must have required property 'fullname'"
+     *     },
+     *     {
+     *         "instancePath": "/user/termsAccepted",
+     *         "schemaPath": "#/properties/user/properties/termsAccepted/type",
+     *         "keyword": "type",
+     *         "params": {
+     *             "type": "boolean"
+     *         },
+     *         "message": "must be boolean"
+     *     },
+     *     {
+     *         "instancePath": "/user/termsAccepted",
+     *         "schemaPath": "#/properties/user/properties/termsAccepted/enum",
+     *         "keyword": "enum",
+     *         "params": {
+     *             "allowedValues": [
+     *                 true
+     *             ]
+     *         },
+     *         "message": "must be equal to one of the allowed values"
+     *     },
+     *     {
+     *         "instancePath": "/user/password",
+     *         "schemaPath": "#/properties/user/properties/password/equalToField",
+     *         "keyword": "equalToField",
+     *         "params": {},
+     *         "message": "should be equal to the value of \"passwordConfirmation\""
+     *     },
+     *     {
+     *         "instancePath": "/user/passwordConfirmation",
+     *         "schemaPath": "#/properties/user/properties/passwordConfirmation/equalToField",
+     *         "keyword": "equalToField",
+     *         "params": {},
+     *         "message": "should be equal to the value of \"password\""
+     *     }
+     * ]
+     *
+     * @example of the same errors after transformation:
+     * {
+     *     "intent": "REQUIRED",
+     *     "user": {
+     *         "username": "REQUIRED",
+     *         "fullname": "REQUIRED",
+     *         "termsAccepted": "FORMAT_ERROR",
+     *         "password": "FIELDS_NOT_EQUAL",
+     *         "passwordConfirmation": "FIELDS_NOT_EQUAL"
+     *     }
+     * }
+     */
+    transformErrors(errors?: ErrorObject[] | null): ErrorResult | undefined {
+        if (!errors) {
+            return undefined;
+        }
+
+        const result: ErrorResult = {};
+
+        errors.forEach((error) => {
+            const code =
+                error.keyword === "format"
+                    ? this.formatCodeMap[error.params.format] || "FORMAT_ERROR"
+                    : this.keywordsCodeMap[error.keyword] || "FORMAT_ERROR";
+
+            const instancePath = error.params.missingProperty
+                ? `${error.instancePath}/${error.params.missingProperty}`
+                : error.instancePath;
+
+            pointer.set(result, instancePath, code);
+        });
+
+        /**
+         * JSON.parse/JSON.stringify is required to fix <1 empty item> issue.
+         * @example
+         * pointer.set(result, "/nested/prop2/0", "ERROR_1");
+         * pointer.set(result, "/nested/prop2/2", "ERROR_2");
+         *
+         * without JSON.parse/JSON.stringify:
+         * result.prop2 === ["ERROR_1", <1 empty item>, "ERROR_2"]
+         *
+         * with JSON.parse/JSON.stringify:
+         * result.prop2 === ["ERROR_1", null, "ERROR_2"]
+         */
+        return JSON.parse(JSON.stringify(result));
+    }
+
+    /**
+     * Validates and cleans data against the schema.
+     * Optionally drops null / empty-string properties (constructor options), then AJV removeAdditional.
+     */
+    validateAndClean(data: AnyObject, jsonSchema: ValidationSchema) {
+        const validated = { ...data };
+
+        if (this.removeNull) {
+            removeEmptyAndNullProperties(validated);
+        }
+
+        if (this.removeEmptyStrings) {
+            removeEmptyStringProperties(validated);
+        }
+
+        const compiledValidator = this.getCompiledValidator({
+            ...jsonSchema,
+            additionalProperties: false,
+        });
+        const isValid = compiledValidator(validated);
+
+        return {
+            isValid,
+            errors: this.transformErrors(compiledValidator.errors || undefined),
+            rawErrors: compiledValidator.errors,
+            validated,
+        };
+    }
+}
+
+/** Shared singleton — hosts register app formats on this instance (null + "" strip on). */
+export const jsonSchemaValidator = new JsonSchemaValidator();
diff --git a/src/js/validator/index.ts b/src/js/validator/index.ts
new file mode 100644
index 00000000..202c720a
--- /dev/null
+++ b/src/js/validator/index.ts
@@ -0,0 +1,4 @@
+export { JsonSchemaValidator, jsonSchemaValidator } from "./JsonSchemaValidator";
+export type { JsonSchemaValidatorOptions } from "./JsonSchemaValidator";
+export type { ErrorObject, SchemaObject } from "ajv";
+export type { AnyObject, ValidationSchema } from "./types";
diff --git a/src/js/validator/rules/equalTo.ts b/src/js/validator/rules/equalTo.ts
new file mode 100644
index 00000000..be5b8add
--- /dev/null
+++ b/src/js/validator/rules/equalTo.ts
@@ -0,0 +1,17 @@
+import Ajv from "ajv";
+
+export default function addEqualToFieldKeyword(ajv: Ajv) {
+    ajv.addKeyword({
+        keyword: "equalToField",
+        type: "string", // Applies to string fields
+        schemaType: "string", // The schema for this keyword should be a string (field name)
+        validate(schema, data, _parentSchema, dataCxt) {
+            const otherFieldValue = dataCxt?.parentData[schema];
+            return data === otherFieldValue;
+        },
+        errors: true, // Enable error handling
+        error: {
+            message: (cxt) => `should be equal to the value of "${cxt.schema}"`,
+        },
+    });
+}
diff --git a/src/js/validator/rules/index.ts b/src/js/validator/rules/index.ts
new file mode 100644
index 00000000..18ac7083
--- /dev/null
+++ b/src/js/validator/rules/index.ts
@@ -0,0 +1,15 @@
+import addJsonSchemaToTypescriptKeywords from "@mat3ra/esse/dist/js/utils/ajvKeywords/jsonSchemaToTypescriptKeywords";
+import type Ajv from "ajv";
+
+import addEqualToFieldKeyword from "./equalTo";
+import addIsoDateKeyword from "./isoDate";
+
+/**
+ * Shared AJV formats/keywords for the standalone validator.
+ * App-specific formats (password, phone, username, email) are registered by the host.
+ */
+export default function addSharedFormatsAndKeywords(ajv: Ajv): void {
+    addJsonSchemaToTypescriptKeywords(ajv);
+    addEqualToFieldKeyword(ajv);
+    addIsoDateKeyword(ajv);
+}
diff --git a/src/js/validator/rules/isoDate.ts b/src/js/validator/rules/isoDate.ts
new file mode 100644
index 00000000..4d83b5d0
--- /dev/null
+++ b/src/js/validator/rules/isoDate.ts
@@ -0,0 +1,37 @@
+import Ajv from "ajv";
+import { AnySchemaObject, DataValidationCxt } from "ajv/dist/types";
+
+export default function addIsoDateKeyword(ajv: Ajv) {
+    ajv.addKeyword({
+        keyword: "isoDate",
+        type: "string",
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        validate(
+            _schema: boolean,
+            data: unknown,
+            _parentSchema?: AnySchemaObject,
+            dataCxt?: DataValidationCxt,
+        ) {
+            if (data === null || typeof data === "undefined") {
+                return true;
+            }
+
+            if (typeof data !== "string") {
+                return false;
+            }
+
+            const isValid = !Number.isNaN(Date.parse(data));
+
+            if (isValid && dataCxt) {
+                dataCxt.parentData[dataCxt.parentDataProperty] = new Date(data);
+            }
+
+            return isValid;
+        },
+        errors: false,
+        modifying: true,
+        metaSchema: {
+            type: "boolean",
+        },
+    });
+}
diff --git a/src/js/validator/types.ts b/src/js/validator/types.ts
new file mode 100644
index 00000000..6a32a506
--- /dev/null
+++ b/src/js/validator/types.ts
@@ -0,0 +1,6 @@
+import type { SchemaObject } from "ajv";
+
+export type ValidationSchema = SchemaObject & { $id: string };
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export type AnyObject = Record<string, any>;
diff --git a/tests/js/generateSchemaMixin.tests.ts b/tests/js/generateSchemaMixin.tests.ts
index 92f0e371..5ebcc22f 100644
--- a/tests/js/generateSchemaMixin.tests.ts
+++ b/tests/js/generateSchemaMixin.tests.ts
@@ -209,6 +209,28 @@ describe("generateSchemaMixin Tests", function () {
         });
     });
 
+    describe("generateShemaMixin - InMemoryEntity type alias", () => {
+        it("should type the entity as InMemoryEntity<BaseInMemoryEntitySchema & Mixin>", () => {
+            const outputPath = path.join(tempDir, "BankableSchemaMixin.ts");
+            const outputPaths = {
+                "property/holder": outputPath,
+            };
+
+            generateShemaMixin(mockSchemas, outputPaths);
+
+            const generatedCode = fs.readFileSync(outputPath, "utf-8");
+            expect(generatedCode).to.include(
+                "import type { BaseInMemoryEntitySchema, PropertyHolder }",
+            );
+            expect(generatedCode).to.include(
+                "export type BankableInMemoryEntity = InMemoryEntity<BaseInMemoryEntitySchema & BankableSchemaMixin>;",
+            );
+            expect(generatedCode).to.not.include(
+                "export type BankableInMemoryEntity = InMemoryEntity<BankableSchemaMixin> & BankableSchemaMixin",
+            );
+        });
+    });
+
     describe("generateShemaMixin - Omit Type Generation", () => {
         it("should not use Omit when skipFields is undefined", () => {
             const outputPath = path.join(tempDir, "NoSkipFieldsSchemaMixin.ts");
diff --git a/tests/js/inMemoryEntitySetBase.tests.ts b/tests/js/inMemoryEntitySetBase.tests.ts
new file mode 100644
index 00000000..6221d3a0
--- /dev/null
+++ b/tests/js/inMemoryEntitySetBase.tests.ts
@@ -0,0 +1,44 @@
+/* eslint-disable no-unused-expressions */
+import type { BaseInMemoryEntitySchema, EntitySetSchema } from "@mat3ra/esse/dist/js/types";
+import { expect } from "chai";
+
+import { InMemoryEntity } from "../../src/js/entity/in_memory";
+import {
+    type InMemoryEntitySetBaseMixin,
+    inMemoryEntitySetBaseMixin,
+} from "../../src/js/entity/set/InMemoryEntitySetBaseMixin";
+
+type WiderEntitySetSchema = BaseInMemoryEntitySchema &
+    EntitySetSchema & {
+        owner?: string;
+    };
+
+/**
+ * Mirrors web-app CoreEntitySet: schema-generic class + interface merge of the
+ * mixin shape (not InMemoryEntitySetBase, which bakes in a narrower `_json`).
+ */
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+interface WiderEntitySet extends InMemoryEntitySetBaseMixin {}
+
+class WiderEntitySet extends InMemoryEntity<WiderEntitySetSchema> {}
+
+inMemoryEntitySetBaseMixin(WiderEntitySet.prototype);
+
+describe("InMemoryEntitySetBaseMixin", () => {
+    it("merges into a schema-generic InMemoryEntity subclass without _json conflict", () => {
+        const entity = new WiderEntitySet({
+            _id: "set-1",
+            isEntitySet: true,
+            entitySetType: "unordered",
+            owner: "account-1",
+        });
+
+        expect(entity.isEntitySet).to.equal(true);
+        expect(entity.entitySetType).to.equal("unordered");
+        expect(entity._json.owner).to.equal("account-1");
+        expect(entity.toJSONForInclusionInEntity()).to.deep.equal({
+            _id: "set-1",
+            type: undefined,
+        });
+    });
+});
diff --git a/tests/js/in_memory.tests.ts b/tests/js/in_memory.tests.ts
index 6037b52b..b647dbb4 100644
--- a/tests/js/in_memory.tests.ts
+++ b/tests/js/in_memory.tests.ts
@@ -1,6 +1,7 @@
 /* eslint-disable no-unused-expressions */
 import { JSONSchema } from "@mat3ra/esse/dist/js/esse/utils";
 import inMemoryEntitySchema from "@mat3ra/esse/dist/js/schema/in_memory_entity/base.json";
+import type { BaseInMemoryEntitySchema } from "@mat3ra/esse/dist/js/types";
 import { expect } from "chai";
 
 import { InMemoryEntity } from "../../src/js/entity/in_memory";
@@ -19,53 +20,100 @@ function validateEntity(entity: DerivedInMemoryEntity) {
 }
 
 describe("InMemoryEntity", () => {
-    const obj = {
-        a: "b",
-        name: "test",
+    const obj: BaseInMemoryEntitySchema = {
+        _id: "123",
+        schemaVersion: "2022.8.16",
     };
 
     it("can be created", () => {
-        const empty = new InMemoryEntity();
-        // eslint-disable-next-line no-unused-expressions
-        expect(empty).to.exist;
+        const empty = new InMemoryEntity({});
         const entity = new InMemoryEntity(obj);
-        // eslint-disable-next-line no-unused-expressions
+
+        expect(empty).to.exist;
         expect(entity).to.exist;
     });
 
     it("prop gets props", () => {
         const entity = new InMemoryEntity(obj);
-        expect(entity.prop("a")).to.equal("b");
-        expect(entity.prop("b")).to.equal(undefined);
-        expect(entity.prop("b", "a")).to.equal("a");
+        expect(entity._id).to.equal(obj._id);
+        expect(entity.schemaVersion).to.equal(obj.schemaVersion);
+        expect(entity.systemName).to.equal(undefined);
     });
 
     it("setProp sets props", () => {
         const entity = new InMemoryEntity(obj);
-        expect(entity.prop("a")).to.equal("b");
-        entity.setProp("b", "c");
-        expect(entity.prop("b")).to.equal("c");
-        entity.setProp("a", "d");
-        expect(entity.prop("a")).to.equal("d");
+        entity.setProp("systemName", "b");
+        expect(entity.systemName).to.equal("b");
+        entity.setProp("slug", "c");
+        expect(entity.slug).to.equal("c");
     });
 
     it("unsetProp unsets props", () => {
-        console.log("obj", obj);
         const entity = new InMemoryEntity(obj);
-        console.log("obj", obj);
-        expect(entity.prop("a")).to.equal("b");
-        entity.unsetProp("a");
-        // eslint-disable-next-line no-unused-expressions
-        expect(entity.prop("a")).not.to.exist;
+        expect(entity._id).to.equal(obj._id);
+        entity.unsetProp("_id");
+        expect(entity._id).to.equal(undefined);
+    });
+
+    it("getAsEntityReference requires _id but not slug", () => {
+        const withoutSlug = new InMemoryEntity({ _id: "123" });
+        expect(withoutSlug.getAsEntityReference()).to.deep.equal({
+            _id: "123",
+            cls: "InMemoryEntity",
+        });
+        expect(withoutSlug.getAsEntityReference(true)).to.deep.equal({ _id: "123" });
+
+        const withSlug = new InMemoryEntity({ _id: "123", slug: "total-energy" });
+        expect(withSlug.getAsEntityReference()).to.deep.equal({
+            _id: "123",
+            slug: "total-energy",
+            cls: "InMemoryEntity",
+        });
+
+        const missingId = new InMemoryEntity({});
+        expect(() => missingId.getAsEntityReference()).to.throw("ENTITY_REFERENCE_ERROR");
     });
 
     it("toJSON converts to JSON", () => {
-        const entity = new DerivedInMemoryEntity({ _id: "123", type: "type" });
+        const entity = new DerivedInMemoryEntity({
+            _id: "123",
+            additional: "additional",
+        } as BaseInMemoryEntitySchema);
         expect(JSON.stringify(entity.toJSON())).to.be.equal(
             JSON.stringify({ _id: "123", schemaVersion: "2022.8.16" }),
         );
     });
 
+    it("toJSON ignores JSON.stringify property-key argument so fields are not stripped", () => {
+        // JSON.stringify calls value.toJSON(key) when serializing a nested object.
+        // systemTeams.owner → toJSON("owner") must not omit the entity's owner field.
+        const entity = new DerivedInMemoryEntity({
+            _id: "123",
+            slug: "owner",
+        } as BaseInMemoryEntitySchema);
+
+        expect(entity.toJSON("owner" as unknown as (keyof BaseInMemoryEntitySchema)[])).to.include({
+            _id: "123",
+            slug: "owner",
+        });
+
+        const wrapped = { owner: entity };
+        const parsed = JSON.parse(JSON.stringify(wrapped));
+        expect(parsed.owner).to.include({ _id: "123", slug: "owner" });
+    });
+
+    it("toJSON still omits when given an explicit exclude array", () => {
+        const entity = new DerivedInMemoryEntity({
+            _id: "123",
+            slug: "owner",
+        } as BaseInMemoryEntitySchema);
+
+        expect(entity.toJSON(["slug"])).to.deep.equal({
+            _id: "123",
+            schemaVersion: "2022.8.16",
+        });
+    });
+
     it("jsonSchema returns correct registered schema", async () => {
         expect(DerivedInMemoryEntity.jsonSchema).to.be.an("object");
         expect(DerivedInMemoryEntity.jsonSchema).to.have.nested.property("properties._id"); // check mix schemas
@@ -73,7 +121,10 @@ describe("InMemoryEntity", () => {
 
     it("jsonSchema validate", async () => {
         const validEntity = new DerivedInMemoryEntity({ _id: "123", slug: "slug" });
-        const invalidEntity = new DerivedInMemoryEntity({ _id: "123", slug: ["slug"] });
+        const invalidEntity = new DerivedInMemoryEntity({
+            _id: "123",
+            slug: ["slug"],
+        } as unknown as BaseInMemoryEntitySchema);
 
         expect(validateEntity(validEntity)).to.be.true;
         expect(validateEntity(invalidEntity)).to.be.false;
@@ -85,7 +136,7 @@ describe("InMemoryEntity", () => {
             slug: "slug",
             additional: "additional",
         };
-        const cleanConfig = new DerivedInMemoryEntity().clean({ ...config });
+        const cleanConfig = new DerivedInMemoryEntity({}).clean({ ...config });
 
         expect(cleanConfig).to.be.deep.equal({
             _id: "123",
diff --git a/tests/js/validator.tests.ts b/tests/js/validator.tests.ts
new file mode 100644
index 00000000..16ae34d6
--- /dev/null
+++ b/tests/js/validator.tests.ts
@@ -0,0 +1,97 @@
+import { expect } from "chai";
+
+import {
+    JsonSchemaValidator,
+    jsonSchemaValidator,
+} from "../../src/js/validator/JsonSchemaValidator";
+
+const cleanSchema = {
+    $id: "test/code-validator-clean",
+    type: "object",
+    properties: {
+        name: { type: "string" },
+        slug: { type: "string" },
+        description: { type: "string" },
+    },
+    required: ["name"],
+    additionalProperties: false,
+};
+
+describe("JsonSchemaValidator.transformErrors", () => {
+    it("maps AJV required and format errors to LIVR-style codes", () => {
+        const transformed = jsonSchemaValidator.transformErrors([
+            {
+                instancePath: "",
+                schemaPath: "#/required",
+                keyword: "required",
+                params: { missingProperty: "intent" },
+                message: "must have required property 'intent'",
+            },
+            {
+                instancePath: "/user/password",
+                schemaPath: "#/properties/user/properties/password/format",
+                keyword: "format",
+                params: { format: "custom-password" },
+                message: 'must match format "custom-password"',
+            },
+        ] as never);
+
+        expect(transformed).to.deep.equal({
+            intent: "REQUIRED",
+            user: {
+                password: "WRONG_PASSWORD",
+            },
+        });
+    });
+});
+
+describe("JsonSchemaValidator.validateAndClean", () => {
+    it("strips nulls, empty strings, and additional properties by default", () => {
+        const data = {
+            name: "Si",
+            slug: null,
+            description: "",
+            owner: { _id: "x" },
+        };
+
+        const result = jsonSchemaValidator.validateAndClean(data, cleanSchema);
+
+        expect(result.isValid).to.equal(true);
+        expect(result.validated).to.deep.equal({ name: "Si" });
+    });
+
+    it("keeps empty strings when removeEmptyStrings is false", () => {
+        const validator = new JsonSchemaValidator({
+            removeNull: true,
+            removeEmptyStrings: false,
+        });
+        const schema = {
+            ...cleanSchema,
+            $id: "test/code-validator-keep-empty",
+        };
+
+        const result = validator.validateAndClean(
+            { name: "Si", slug: null, description: "" },
+            schema,
+        );
+
+        expect(result.isValid).to.equal(true);
+        expect(result.validated).to.deep.equal({ name: "Si", description: "" });
+    });
+
+    it("leaves null keys for AJV when removeNull is false", () => {
+        // AJV coerceTypes may turn null → "" for string fields; the option only skips our pre-strip.
+        const validator = new JsonSchemaValidator({
+            removeNull: false,
+            removeEmptyStrings: true,
+        });
+        const schema = {
+            ...cleanSchema,
+            $id: "test/code-validator-keep-null-keys",
+        };
+
+        const result = validator.validateAndClean({ name: "Si", slug: null }, schema);
+
+        expect(Object.prototype.hasOwnProperty.call(result.validated, "slug")).to.equal(true);
+    });
+});