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| class MemoryStore {
private vectorDb: VectorDatabase;
private metadataDb: Database;
constructor(config: MemoryStoreConfig) {
this.vectorDb = new LanceDB({
path: config.dbPath,
embeddingDimension: 1536,
});
this.metadataDb = new Database(config.metadataPath);
this.initMetadataSchema();
}
private initMetadataSchema(): void {
this.metadataDb.exec(`
CREATE TABLE IF NOT EXISTS memories (
id TEXT PRIMARY KEY,
content TEXT,
type TEXT,
category TEXT,
importance INTEGER,
confidence REAL,
source TEXT,
created_at TEXT,
updated_at TEXT,
expires_at TEXT,
last_accessed_at TEXT,
access_count INTEGER,
tags TEXT
)
`);
this.metadataDb.exec(`
CREATE INDEX IF NOT EXISTS idx_memories_type
ON memories(type)
`);
this.metadataDb.exec(`
CREATE INDEX IF NOT EXISTS idx_memories_importance
ON memories(importance DESC)
`);
}
async add(memory: Memory): Promise<void> {
if (memory.embedding) {
await this.vectorDb.insert({
id: memory.id,
vector: memory.embedding,
metadata: {
content: memory.content,
type: memory.type,
},
});
}
await this.metadataDb.run(`
INSERT INTO memories (
id, content, type, category, importance, confidence,
source, created_at, updated_at, expires_at,
access_count, tags
) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
`, [
memory.id,
memory.content,
memory.type,
memory.category,
memory.importance,
memory.confidence,
memory.source,
memory.createdAt.toISOString(),
memory.updatedAt.toISOString(),
memory.expiresAt?.toISOString(),
memory.accessCount,
JSON.stringify(memory.tags),
]);
}
async search(options: SearchOptions): Promise<Memory[]> {
const queryEmbedding = await this.llm.embed(options.query);
const vectorResults = await this.vectorDb.search({
query: queryEmbedding,
limit: options.limit || 10,
filter: options.filter,
threshold: options.threshold || 0.7,
});
const memories: Memory[] = [];
for (const result of vectorResults) {
const memory = await this.get(result.id);
if (memory) {
memory.similarity = result.similarity;
memories.push(memory);
}
}
memories.sort((a, b) => {
const scoreA = (a.similarity || 0) * 0.7 + (a.importance / 5) * 0.3;
const scoreB = (b.similarity || 0) * 0.7 + (b.importance / 5) * 0.3;
return scoreB - scoreA;
});
return memories;
}
async get(id: string): Promise<Memory | null> {
const row = await this.metadataDb.get(
'SELECT * FROM memories WHERE id = ?',
[id]
);
if (!row) {
return null;
}
return {
id: row.id,
content: row.content,
type: row.type,
category: row.category,
importance: row.importance,
confidence: row.confidence,
source: row.source,
createdAt: new Date(row.created_at),
updatedAt: new Date(row.updated_at),
expiresAt: row.expires_at ? new Date(row.expires_at) : undefined,
lastAccessedAt: row.last_accessed_at ? new Date(row.last_accessed_at) : undefined,
accessCount: row.access_count,
tags: JSON.parse(row.tags || '[]'),
};
}
async update(memory: Memory): Promise<void> {
await this.metadataDb.run(`
UPDATE memories SET
content = ?,
type = ?,
category = ?,
importance = ?,
confidence = ?,
updated_at = ?,
access_count = ?
WHERE id = ?
`, [
memory.content,
memory.type,
memory.category,
memory.importance,
memory.confidence,
memory.updatedAt.toISOString(),
memory.accessCount + 1,
memory.id,
]);
}
async delete(id: string): Promise<void> {
await this.vectorDb.delete(id);
await this.metadataDb.run('DELETE FROM memories WHERE id = ?', [id]);
}
async cleanup(): Promise<number> {
const now = new Date();
const rows = await this.metadataDb.all(
'SELECT id FROM memories WHERE expires_at < ?',
[now.toISOString()]
);
let deleted = 0;
for (const row of rows) {
await this.delete(row.id);
deleted++;
}
return deleted;
}
async import(memories: Memory[]): Promise<void> {
const tx = await this.metadataDb.transaction();
try {
for (const memory of memories) {
await this.add(memory);
}
await tx.commit();
} catch (error) {
await tx.rollback();
throw error;
}
}
async export(filter?: MemoryFilter): Promise<Memory[]> {
let query = 'SELECT * FROM memories';
const params: any[] = [];
if (filter?.type) {
query += ' WHERE type = ?';
params.push(filter.type);
}
const rows = await this.metadataDb.all(query, params);
return rows.map(row => this.rowToMemory(row));
}
private rowToMemory(row: any): Memory {
return {
id: row.id,
content: row.content,
type: row.type,
category: row.category,
importance: row.importance,
confidence: row.confidence,
source: row.source,
createdAt: new Date(row.created_at),
updatedAt: new Date(row.updated_at),
expiresAt: row.expires_at ? new Date(row.expires_at) : undefined,
lastAccessedAt: row.last_accessed_at ? new Date(row.last_accessed_at) : undefined,
accessCount: row.access_count,
tags: JSON.parse(row.tags || '[]'),
};
}
}
interface SearchOptions {
query: string;
limit?: number;
filter?: Record<string, any>;
threshold?: number;
}
interface MemoryFilter {
type?: MemoryType;
minImportance?: number;
tags?: string[];
}
|