feat(core): initialize project structure, postgres schema and docker setup

db/database.py

@@ -0,0 +1,85 @@
+import asyncpg
+import os
+from typing import Optional
+
+DATABASE_URL = os.getenv(
+    "DATABASE_URL",
+    f"postgresql://{os.getenv('POSTGRES_USER', 'postgres')}:{os.getenv('POSTGRES_PASSWORD', 'postgres')}@{os.getenv('POSTGRES_HOST', 'localhost')}:{os.getenv('POSTGRES_PORT', '5432')}/{os.getenv('POSTGRES_DB', 'copykar')}"
+)
+
+SCHEMA = """
+CREATE TABLE IF NOT EXISTS sources (
+    id SERIAL PRIMARY KEY,
+    channel_id BIGINT UNIQUE NOT NULL,
+    username VARCHAR(255),
+    title VARCHAR(255),
+    is_active BOOLEAN DEFAULT TRUE,
+    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS targets (
+    id SERIAL PRIMARY KEY,
+    channel_id BIGINT UNIQUE NOT NULL,
+    title VARCHAR(255),
+    username VARCHAR(255),
+    post_interval_min INT DEFAULT 30,
+    last_post_time TIMESTAMPTZ,
+    is_active BOOLEAN DEFAULT TRUE,
+    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS posts (
+    id BIGSERIAL PRIMARY KEY,
+    source_channel_id BIGINT NOT NULL,
+    source_message_id BIGINT NOT NULL,
+    raw_text TEXT,
+    media_path TEXT,
+    media_type VARCHAR(64),
+    content_hash VARCHAR(128),
+    tags TEXT[] DEFAULT '{}',
+    is_duplicate BOOLEAN DEFAULT FALSE,
+    duplicate_of_id BIGINT REFERENCES posts(id) ON DELETE SET NULL,
+    similarity_reason TEXT,
+    subject VARCHAR(255),
+    ai_text TEXT,
+    suggested_target_id INT REFERENCES targets(id) ON DELETE SET NULL,
+    target_channel_id INT REFERENCES targets(id) ON DELETE SET NULL,
+    status VARCHAR(32) DEFAULT 'pending_ai',
+    review_message_id BIGINT,
+    scheduled_at TIMESTAMPTZ,
+    published_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT unique_source_message UNIQUE (source_channel_id, source_message_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_posts_content_hash ON posts(content_hash);
+CREATE INDEX IF NOT EXISTS idx_posts_status ON posts(status);
+CREATE INDEX IF NOT EXISTS idx_posts_target_status ON posts(target_channel_id, status);
+CREATE INDEX IF NOT EXISTS idx_posts_tags ON posts USING GIN (tags);
+CREATE INDEX IF NOT EXISTS idx_posts_created_at ON posts(created_at DESC);
+
+CREATE TABLE IF NOT EXISTS settings (
+    key VARCHAR(128) PRIMARY KEY,
+    value TEXT NOT NULL,
+    description TEXT
+);
+"""
+
+_pool: Optional[asyncpg.Pool] = None
+
+async def get_db_pool(dsn: str = DATABASE_URL) -> asyncpg.Pool:
+    global _pool
+    if _pool is None or _pool._closed:
+        _pool = await asyncpg.create_pool(dsn=dsn, min_size=2, max_size=10)
+    return _pool
+
+async def close_db_pool():
+    global _pool
+    if _pool is not None and not _pool._closed:
+        await _pool.close()
+        _pool = None
+
+async def init_db(dsn: str = DATABASE_URL):
+    pool = await get_db_pool(dsn)
+    async with pool.acquire() as conn:
+        await conn.execute(SCHEMA)