fix(knowledge): add pgvector transformer for TypeORM embedding columns

TypeORM doesn't natively support pgvector type. Add custom transformer
to convert between JavaScript arrays and pgvector string format [1,2,3].

Fixes: invalid input syntax for type vector errors

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/services/knowledge-service/src/infrastructure/database/postgres/entities/knowledge-article.orm.ts

@@ -7,6 +7,22 @@ import {
   Index,
 } from 'typeorm';
 
+/**
+ * pgvector 类型转换器
+ */
+const vectorTransformer = {
+  to: (value: number[] | undefined): string | null => {
+    if (!value || value.length === 0) return null;
+    return `[${value.join(',')}]`;
+  },
+  from: (value: string | null): number[] | undefined => {
+    if (!value) return undefined;
+    const str = value.replace(/^\[|\]$/g, '');
+    if (!str) return undefined;
+    return str.split(',').map(Number);
+  },
+};
+
 @Entity('knowledge_articles')
 @Index('idx_knowledge_articles_category', ['category'])
 @Index('idx_knowledge_articles_published', ['isPublished'])
@@ -35,7 +51,11 @@ export class KnowledgeArticleORM {
   @Column({ name: 'source_url', length: 1000, nullable: true })
   sourceUrl?: string;
 
-  @Column('float', { array: true, nullable: true })
+  @Column({
+    type: 'text',
+    nullable: true,
+    transformer: vectorTransformer,
+  })
   embedding?: number[];
 
   @Column({ name: 'is_published', default: false })

packages/services/knowledge-service/src/infrastructure/database/postgres/entities/knowledge-chunk.orm.ts

@@ -6,6 +6,22 @@ import {
   Index,
 } from 'typeorm';
 
+/**
+ * pgvector 类型转换器
+ */
+const vectorTransformer = {
+  to: (value: number[] | undefined): string | null => {
+    if (!value || value.length === 0) return null;
+    return `[${value.join(',')}]`;
+  },
+  from: (value: string | null): number[] | undefined => {
+    if (!value) return undefined;
+    const str = value.replace(/^\[|\]$/g, '');
+    if (!str) return undefined;
+    return str.split(',').map(Number);
+  },
+};
+
 @Entity('knowledge_chunks')
 @Index('idx_knowledge_chunks_article', ['articleId'])
 export class KnowledgeChunkORM {
@@ -24,7 +40,11 @@ export class KnowledgeChunkORM {
   @Column({ name: 'chunk_type', length: 20 })
   chunkType: string;
 
-  @Column('float', { array: true, nullable: true })
+  @Column({
+    type: 'text',
+    nullable: true,
+    transformer: vectorTransformer,
+  })
   embedding?: number[];
 
   @Column('jsonb', { default: '{}' })

packages/services/knowledge-service/src/infrastructure/database/postgres/entities/system-experience.orm.ts

@@ -7,6 +7,22 @@ import {
   Index,
 } from 'typeorm';
 
+/**
+ * pgvector 类型转换器
+ */
+const vectorTransformer = {
+  to: (value: number[] | undefined): string | null => {
+    if (!value || value.length === 0) return null;
+    return `[${value.join(',')}]`;
+  },
+  from: (value: string | null): number[] | undefined => {
+    if (!value) return undefined;
+    const str = value.replace(/^\[|\]$/g, '');
+    if (!str) return undefined;
+    return str.split(',').map(Number);
+  },
+};
+
 @Entity('system_experiences')
 @Index('idx_system_experiences_type', ['experienceType'])
 @Index('idx_system_experiences_status', ['verificationStatus'])
@@ -51,7 +67,11 @@ export class SystemExperienceORM {
   @Column({ name: 'negative_count', default: 0 })
   negativeCount: number;
 
-  @Column('float', { array: true, nullable: true })
+  @Column({
+    type: 'text',
+    nullable: true,
+    transformer: vectorTransformer,
+  })
   embedding?: number[];
 
   @Column({ name: 'is_active', default: false })

packages/services/knowledge-service/src/infrastructure/database/postgres/entities/user-memory.orm.ts

@@ -7,6 +7,23 @@ import {
   Index,
 } from 'typeorm';
 
+/**
+ * pgvector 类型转换器
+ * TypeORM 不原生支持 pgvector，需要手动转换格式
+ */
+const vectorTransformer = {
+  to: (value: number[] | undefined): string | null => {
+    if (!value || value.length === 0) return null;
+    return `[${value.join(',')}]`;
+  },
+  from: (value: string | null): number[] | undefined => {
+    if (!value) return undefined;
+    const str = value.replace(/^\[|\]$/g, '');
+    if (!str) return undefined;
+    return str.split(',').map(Number);
+  },
+};
+
 @Entity('user_memories')
 @Index('idx_user_memories_user', ['userId'])
 @Index('idx_user_memories_type', ['memoryType'])
@@ -32,7 +49,11 @@ export class UserMemoryORM {
   @Column({ name: 'related_category', length: 50, nullable: true })
   relatedCategory?: string;
 
-  @Column('float', { array: true, nullable: true })
+  @Column({
+    type: 'text',
+    nullable: true,
+    transformer: vectorTransformer,
+  })
   embedding?: number[];
 
   @Column({ name: 'access_count', default: 0 })