CREATE TABLE memory_facts (
    id SERIAL PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users(id),
    content TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE conversation_summaries (
    conversation_id INTEGER PRIMARY KEY REFERENCES conversations(id),
    summary TEXT NOT NULL,
    embedding vector(768) NOT NULL,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);