feat: AI 余额监控服务（平台/账号 CRUD、并发轮询、Telegram 阈值提醒）

app/db.py

@@ -0,0 +1,83 @@
+"""SQLite 数据层：连接短生命周期（每次操作新建），线程安全。"""
+
+from __future__ import annotations
+
+import sqlite3
+from pathlib import Path
+
+DATA_DIR = Path(__file__).resolve().parent.parent / "data"
+DB_PATH = DATA_DIR / "monitor.db"
+
+SCHEMA = """
+CREATE TABLE IF NOT EXISTS platforms (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    name            TEXT NOT NULL UNIQUE,
+    currency        TEXT NOT NULL DEFAULT 'USD',
+    icon            TEXT NOT NULL DEFAULT '',
+    method          TEXT NOT NULL DEFAULT 'GET',
+    url             TEXT NOT NULL,
+    headers         TEXT NOT NULL DEFAULT '{}',
+    body            TEXT NOT NULL DEFAULT '',
+    balance_path    TEXT NOT NULL,
+    interval_seconds INTEGER,
+    retry_count     INTEGER,
+    timeout_seconds INTEGER,
+    enabled         INTEGER NOT NULL DEFAULT 1,
+    note            TEXT NOT NULL DEFAULT '',
+    created_at      TEXT NOT NULL DEFAULT (datetime('now', 'localtime')),
+    updated_at      TEXT NOT NULL DEFAULT (datetime('now', 'localtime'))
+);
+
+CREATE TABLE IF NOT EXISTS accounts (
+    id              INTEGER PRIMARY KEY AUTOINCREMENT,
+    platform_id     INTEGER NOT NULL REFERENCES platforms(id) ON DELETE CASCADE,
+    name            TEXT NOT NULL,
+    api_key         TEXT NOT NULL,
+    threshold       REAL NOT NULL DEFAULT 0,
+    enabled         INTEGER NOT NULL DEFAULT 1,
+    alert_armed     INTEGER NOT NULL DEFAULT 1,
+    last_balance    REAL,
+    last_status     TEXT NOT NULL DEFAULT 'pending',
+    last_error      TEXT NOT NULL DEFAULT '',
+    last_check_at   TEXT,
+    note            TEXT NOT NULL DEFAULT '',
+    created_at      TEXT NOT NULL DEFAULT (datetime('now', 'localtime')),
+    updated_at      TEXT NOT NULL DEFAULT (datetime('now', 'localtime'))
+);
+
+CREATE TABLE IF NOT EXISTS balance_history (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    account_id  INTEGER NOT NULL REFERENCES accounts(id) ON DELETE CASCADE,
+    balance     REAL NOT NULL,
+    checked_at  TEXT NOT NULL DEFAULT (datetime('now', 'localtime'))
+);
+
+CREATE TABLE IF NOT EXISTS alert_log (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    account_id  INTEGER NOT NULL,
+    type        TEXT NOT NULL,
+    message     TEXT NOT NULL,
+    sent_at     TEXT NOT NULL DEFAULT (datetime('now', 'localtime'))
+);
+
+CREATE INDEX IF NOT EXISTS idx_accounts_platform ON accounts(platform_id);
+CREATE INDEX IF NOT EXISTS idx_history_account ON balance_history(account_id, id);
+CREATE INDEX IF NOT EXISTS idx_alert_account ON alert_log(account_id);
+"""
+
+
+def get_conn() -> sqlite3.Connection:
+    conn = sqlite3.connect(DB_PATH, timeout=30)
+    conn.row_factory = sqlite3.Row
+    conn.execute("PRAGMA foreign_keys = ON")
+    return conn
+
+
+def init_db() -> None:
+    DATA_DIR.mkdir(parents=True, exist_ok=True)
+    with get_conn() as conn:
+        conn.executescript(SCHEMA)
+
+
+def rows_to_dicts(rows: list[sqlite3.Row]) -> list[dict]:
+    return [dict(r) for r in rows]