功能：实现 Danding_Points 积分系统插件

- 新增积分系统插件，支持积分查询、签到、转账等核心功能
- 包含对应的测试脚本

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

danding_bot/plugins/danding_points/database.py

@@ -0,0 +1,100 @@
+import sqlite3
+import os
+from datetime import datetime
+from typing import Optional, List, Dict, Any
+from .config import Config
+
+
+class PointsDatabase:
+    """SQLite database handler for points system."""
+
+    def __init__(self, config: Config):
+        self.config = config
+        self.db_path = config.POINTS_DB_FILE
+        self._ensure_db_dir()
+        self._init_db()
+
+    def _ensure_db_dir(self):
+        """Create database directory if it doesn't exist."""
+        db_dir = os.path.dirname(self.db_path)
+        if db_dir:
+            os.makedirs(db_dir, exist_ok=True)
+
+    def _init_db(self):
+        """Initialize database tables."""
+        conn = sqlite3.connect(self.db_path, timeout=5.0)
+        cursor = conn.cursor()
+
+        # Create user_points table
+        cursor.execute(
+            """
+            CREATE TABLE IF NOT EXISTS user_points (
+                user_id TEXT PRIMARY KEY,
+                points INTEGER NOT NULL DEFAULT 0 CHECK(points >= 0),
+                total_earned INTEGER NOT NULL DEFAULT 0,
+                total_spent INTEGER NOT NULL DEFAULT 0,
+                created_at TEXT NOT NULL,
+                updated_at TEXT NOT NULL
+            )
+            """
+        )
+
+        # Create point_transactions table
+        cursor.execute(
+            """
+            CREATE TABLE IF NOT EXISTS point_transactions (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                user_id TEXT NOT NULL,
+                amount INTEGER NOT NULL,
+                balance_after INTEGER NOT NULL,
+                source TEXT NOT NULL,
+                reason TEXT,
+                created_at TEXT NOT NULL
+            )
+            """
+        )
+
+        # Create indexes
+        cursor.execute(
+            "CREATE INDEX IF NOT EXISTS idx_transactions_user_id ON point_transactions(user_id)"
+        )
+        cursor.execute(
+            "CREATE INDEX IF NOT EXISTS idx_transactions_source ON point_transactions(source)"
+        )
+        cursor.execute(
+            "CREATE INDEX IF NOT EXISTS idx_transactions_created_at ON point_transactions(created_at)"
+        )
+
+        conn.commit()
+        conn.close()
+
+    def get_connection(self) -> sqlite3.Connection:
+        """Get a database connection."""
+        conn = sqlite3.connect(self.db_path, timeout=5.0)
+        conn.row_factory = sqlite3.Row
+        return conn
+
+    def get_user_balance(self, user_id: str) -> int:
+        """Get user's current points balance."""
+        conn = self.get_connection()
+        cursor = conn.cursor()
+        cursor.execute("SELECT points FROM user_points WHERE user_id = ?", (user_id,))
+        row = cursor.fetchone()
+        conn.close()
+        return row["points"] if row else 0
+
+    def ensure_user_exists(self, user_id: str) -> None:
+        """Create user account if it doesn't exist."""
+        conn = self.get_connection()
+        cursor = conn.cursor()
+        now = datetime.now().isoformat()
+        cursor.execute(
+            """
+            INSERT OR IGNORE INTO user_points
+            (user_id, points, total_earned, total_spent, created_at, updated_at)
+            VALUES (?, 0, 0, 0, ?, ?)
+            """,
+            (user_id, now, now),
+        )
+        conn.commit()
+        conn.close()