perf(db): tune sqlite pool and add maintenance scheduler

.env.example

@@ -18,6 +18,17 @@ SESSION_COOKIE_SECURE=false  # 使用HTTPS时设为true
 # ==================== 数据库配置 ====================
 DB_FILE=data/app_data.db
 DB_POOL_SIZE=5
+DB_CONNECT_TIMEOUT_SECONDS=10
+DB_BUSY_TIMEOUT_MS=10000
+DB_CACHE_SIZE_KB=8192
+DB_WAL_AUTOCHECKPOINT_PAGES=1000
+DB_MMAP_SIZE_MB=256
+DB_LOCK_RETRY_COUNT=3
+DB_LOCK_RETRY_BASE_MS=50
+DB_PRAGMA_OPTIMIZE_INTERVAL_SECONDS=21600
+DB_ANALYZE_INTERVAL_SECONDS=86400
+DB_WAL_CHECKPOINT_INTERVAL_SECONDS=43200
+DB_WAL_CHECKPOINT_MODE=PASSIVE
 
 # ==================== 并发控制配置 ====================
 MAX_CONCURRENT_GLOBAL=2

app.py

@@ -35,7 +35,7 @@ from realtime.status_push import status_push_worker
 from routes import register_blueprints
 from security import init_security_middleware
 from services.checkpoints import init_checkpoint_manager
-from services.maintenance import start_cleanup_scheduler, start_kdocs_monitor
+from services.maintenance import start_cleanup_scheduler, start_database_maintenance_scheduler, start_kdocs_monitor
 from services.request_metrics import record_request_metric
 from services.models import User
 from services.runtime import init_runtime
@@ -407,6 +407,7 @@ if __name__ == "__main__":
     _init_optional_email_service()
 
     start_cleanup_scheduler()
+    start_database_maintenance_scheduler()
     start_kdocs_monitor()
 
     _load_and_apply_scheduler_limits()

app_config.py

@@ -126,6 +126,17 @@ class Config:
     # ==================== 数据库配置 ====================
     DB_FILE = os.environ.get("DB_FILE", "data/app_data.db")
     DB_POOL_SIZE = int(os.environ.get("DB_POOL_SIZE", "5"))
+    DB_CONNECT_TIMEOUT_SECONDS = int(os.environ.get("DB_CONNECT_TIMEOUT_SECONDS", "10"))
+    DB_BUSY_TIMEOUT_MS = int(os.environ.get("DB_BUSY_TIMEOUT_MS", "10000"))
+    DB_CACHE_SIZE_KB = int(os.environ.get("DB_CACHE_SIZE_KB", "8192"))
+    DB_WAL_AUTOCHECKPOINT_PAGES = int(os.environ.get("DB_WAL_AUTOCHECKPOINT_PAGES", "1000"))
+    DB_MMAP_SIZE_MB = int(os.environ.get("DB_MMAP_SIZE_MB", "256"))
+    DB_LOCK_RETRY_COUNT = int(os.environ.get("DB_LOCK_RETRY_COUNT", "3"))
+    DB_LOCK_RETRY_BASE_MS = int(os.environ.get("DB_LOCK_RETRY_BASE_MS", "50"))
+    DB_PRAGMA_OPTIMIZE_INTERVAL_SECONDS = int(os.environ.get("DB_PRAGMA_OPTIMIZE_INTERVAL_SECONDS", "21600"))
+    DB_ANALYZE_INTERVAL_SECONDS = int(os.environ.get("DB_ANALYZE_INTERVAL_SECONDS", "86400"))
+    DB_WAL_CHECKPOINT_INTERVAL_SECONDS = int(os.environ.get("DB_WAL_CHECKPOINT_INTERVAL_SECONDS", "43200"))
+    DB_WAL_CHECKPOINT_MODE = os.environ.get("DB_WAL_CHECKPOINT_MODE", "PASSIVE")
 
     # ==================== 浏览器配置 ====================
     SCREENSHOTS_DIR = os.environ.get("SCREENSHOTS_DIR", "截图")
@@ -249,6 +260,20 @@ class Config:
 
         if cls.DB_POOL_SIZE < 1:
             errors.append("DB_POOL_SIZE必须大于0")
+        if cls.DB_CONNECT_TIMEOUT_SECONDS < 1:
+            errors.append("DB_CONNECT_TIMEOUT_SECONDS必须大于0")
+        if cls.DB_BUSY_TIMEOUT_MS < 100:
+            errors.append("DB_BUSY_TIMEOUT_MS必须至少100毫秒")
+        if cls.DB_CACHE_SIZE_KB < 1024:
+            errors.append("DB_CACHE_SIZE_KB建议至少1024")
+        if cls.DB_WAL_AUTOCHECKPOINT_PAGES < 100:
+            errors.append("DB_WAL_AUTOCHECKPOINT_PAGES建议至少100")
+        if cls.DB_MMAP_SIZE_MB < 0:
+            errors.append("DB_MMAP_SIZE_MB不能为负数")
+        if cls.DB_LOCK_RETRY_COUNT < 0:
+            errors.append("DB_LOCK_RETRY_COUNT不能为负数")
+        if cls.DB_LOCK_RETRY_BASE_MS < 10:
+            errors.append("DB_LOCK_RETRY_BASE_MS建议至少10毫秒")
 
         # 验证日志配置
         if cls.LOG_LEVEL not in ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]:

db_pool.py

@@ -7,12 +7,28 @@
 
 import sqlite3
 import threading
+import time
 from queue import Empty, Full, Queue
 
+from app_config import get_config
 from app_logger import get_logger
 
 
 logger = get_logger("database")
+config = get_config()
+
+DB_CONNECT_TIMEOUT_SECONDS = max(1, int(getattr(config, "DB_CONNECT_TIMEOUT_SECONDS", 10)))
+DB_BUSY_TIMEOUT_MS = max(1000, int(getattr(config, "DB_BUSY_TIMEOUT_MS", 10000)))
+DB_CACHE_SIZE_KB = max(1024, int(getattr(config, "DB_CACHE_SIZE_KB", 8192)))
+DB_WAL_AUTOCHECKPOINT_PAGES = max(100, int(getattr(config, "DB_WAL_AUTOCHECKPOINT_PAGES", 1000)))
+DB_MMAP_SIZE_MB = max(0, int(getattr(config, "DB_MMAP_SIZE_MB", 256)))
+DB_LOCK_RETRY_COUNT = max(0, int(getattr(config, "DB_LOCK_RETRY_COUNT", 3)))
+DB_LOCK_RETRY_BASE_MS = max(10, int(getattr(config, "DB_LOCK_RETRY_BASE_MS", 50)))
+
+
+def _is_lock_conflict_error(error: sqlite3.OperationalError) -> bool:
+    message = str(error or "").lower()
+    return ("locked" in message) or ("busy" in message)
 
 
 class ConnectionPool:
@@ -46,16 +62,29 @@ class ConnectionPool:
 
     def _create_connection(self):
         """创建新的数据库连接"""
-        conn = sqlite3.connect(self.database, check_same_thread=False)
+        conn = sqlite3.connect(
+            self.database,
+            check_same_thread=False,
+            timeout=DB_CONNECT_TIMEOUT_SECONDS,
+        )
         conn.row_factory = sqlite3.Row
-        # 启用外键约束，确保 ON DELETE CASCADE 等约束生效
+        pragma_statements = [
-        conn.execute("PRAGMA foreign_keys=ON")
+            "PRAGMA foreign_keys=ON",
-        # 设置WAL模式提高并发性能
+            "PRAGMA journal_mode=WAL",
-        conn.execute("PRAGMA journal_mode=WAL")
+            "PRAGMA synchronous=NORMAL",
-        # 在WAL模式下使用NORMAL同步，兼顾性能与可靠性
+            f"PRAGMA busy_timeout={DB_BUSY_TIMEOUT_MS}",
-        conn.execute("PRAGMA synchronous=NORMAL")
+            "PRAGMA temp_store=MEMORY",
-        # 设置合理的超时时间
+            f"PRAGMA cache_size={-DB_CACHE_SIZE_KB}",
-        conn.execute("PRAGMA busy_timeout=5000")
+            f"PRAGMA wal_autocheckpoint={DB_WAL_AUTOCHECKPOINT_PAGES}",
+        ]
+        if DB_MMAP_SIZE_MB > 0:
+            pragma_statements.append(f"PRAGMA mmap_size={DB_MMAP_SIZE_MB * 1024 * 1024}")
+
+        for statement in pragma_statements:
+            try:
+                conn.execute(statement)
+            except sqlite3.DatabaseError as e:
+                logger.warning(f"设置数据库参数失败 ({statement}): {e}")
         return conn
 
     def _close_connection(self, conn) -> None:
@@ -198,7 +227,20 @@ class PooledConnection:
 
     def commit(self):
         """提交事务"""
-        self._conn.commit()
+        for attempt in range(DB_LOCK_RETRY_COUNT + 1):
+            try:
+                self._conn.commit()
+                return
+            except sqlite3.OperationalError as e:
+                if (not _is_lock_conflict_error(e)) or attempt >= DB_LOCK_RETRY_COUNT:
+                    raise
+
+                sleep_seconds = (DB_LOCK_RETRY_BASE_MS * (2**attempt)) / 1000.0
+                logger.warning(
+                    f"数据库提交遇到锁冲突，{sleep_seconds:.3f}s 后重试 "
+                    f"({attempt + 1}/{DB_LOCK_RETRY_COUNT})"
+                )
+                time.sleep(sleep_seconds)
 
     def rollback(self):
         """回滚事务"""

services/maintenance.py

@@ -29,6 +29,12 @@ config = get_config()
 USER_ACCOUNTS_EXPIRE_SECONDS = int(getattr(config, "USER_ACCOUNTS_EXPIRE_SECONDS", 3600))
 BATCH_TASK_EXPIRE_SECONDS = int(getattr(config, "BATCH_TASK_EXPIRE_SECONDS", 21600))
 PENDING_RANDOM_EXPIRE_SECONDS = int(getattr(config, "PENDING_RANDOM_EXPIRE_SECONDS", 7200))
+DB_PRAGMA_OPTIMIZE_INTERVAL_SECONDS = max(300, int(getattr(config, "DB_PRAGMA_OPTIMIZE_INTERVAL_SECONDS", 21600)))
+DB_ANALYZE_INTERVAL_SECONDS = max(0, int(getattr(config, "DB_ANALYZE_INTERVAL_SECONDS", 86400)))
+DB_WAL_CHECKPOINT_INTERVAL_SECONDS = max(0, int(getattr(config, "DB_WAL_CHECKPOINT_INTERVAL_SECONDS", 43200)))
+DB_WAL_CHECKPOINT_MODE = str(getattr(config, "DB_WAL_CHECKPOINT_MODE", "PASSIVE") or "PASSIVE").upper().strip()
+if DB_WAL_CHECKPOINT_MODE not in {"PASSIVE", "FULL", "RESTART", "TRUNCATE"}:
+    DB_WAL_CHECKPOINT_MODE = "PASSIVE"
 
 # 金山文档离线通知状态：每次掉线只通知一次，恢复在线后重置
 _kdocs_offline_notified: bool = False
@@ -275,6 +281,80 @@ def start_cleanup_scheduler() -> None:
     logger.info("内存清理调度器已启动")
 
 
+def _execute_db_statement(statement: str, *, commit: bool = False, fetchone: bool = False):
+    import db_pool
+
+    with db_pool.get_db() as conn:
+        conn.execute(statement)
+        row = conn.fetchone() if fetchone else None
+        if commit:
+            conn.commit()
+        return row
+
+
+def optimize_database_runtime() -> None:
+    """执行 SQLite 运行期优化，提升查询计划和页缓存命中率。"""
+    row = _execute_db_statement("PRAGMA optimize", fetchone=True)
+    if row:
+        logger.debug(f"[DB维护] PRAGMA optimize 已执行: {tuple(row)}")
+    else:
+        logger.debug("[DB维护] PRAGMA optimize 已执行")
+
+
+def analyze_database_stats() -> None:
+    """执行 ANALYZE，刷新统计信息，提升复杂查询稳定性。"""
+    _execute_db_statement("ANALYZE", commit=True)
+    logger.info("[DB维护] ANALYZE 已完成")
+
+
+def checkpoint_database_wal() -> None:
+    """定期执行 WAL checkpoint，控制 WAL 文件体积。"""
+    row = _execute_db_statement(
+        f"PRAGMA wal_checkpoint({DB_WAL_CHECKPOINT_MODE})",
+        fetchone=True,
+    )
+    if row:
+        logger.debug(f"[DB维护] WAL checkpoint({DB_WAL_CHECKPOINT_MODE}) 结果: {tuple(row)}")
+    else:
+        logger.debug(f"[DB维护] WAL checkpoint({DB_WAL_CHECKPOINT_MODE}) 已执行")
+
+
+def start_database_maintenance_scheduler() -> None:
+    """启动数据库维护调度器。"""
+    _start_daemon_loop(
+        "db-optimize",
+        startup_delay=180,
+        interval_seconds=DB_PRAGMA_OPTIMIZE_INTERVAL_SECONDS,
+        job=optimize_database_runtime,
+        error_tag="[DB维护] PRAGMA optimize 执行失败",
+    )
+
+    if DB_ANALYZE_INTERVAL_SECONDS > 0:
+        _start_daemon_loop(
+            "db-analyze",
+            startup_delay=300,
+            interval_seconds=DB_ANALYZE_INTERVAL_SECONDS,
+            job=analyze_database_stats,
+            error_tag="[DB维护] ANALYZE 执行失败",
+        )
+
+    if DB_WAL_CHECKPOINT_INTERVAL_SECONDS > 0:
+        _start_daemon_loop(
+            "db-wal-checkpoint",
+            startup_delay=420,
+            interval_seconds=DB_WAL_CHECKPOINT_INTERVAL_SECONDS,
+            job=checkpoint_database_wal,
+            error_tag="[DB维护] WAL checkpoint 执行失败",
+        )
+
+    logger.info(
+        "[DB维护] 调度器已启动: "
+        f"optimize={DB_PRAGMA_OPTIMIZE_INTERVAL_SECONDS}s, "
+        f"analyze={DB_ANALYZE_INTERVAL_SECONDS}s, "
+        f"checkpoint={DB_WAL_CHECKPOINT_INTERVAL_SECONDS}s({DB_WAL_CHECKPOINT_MODE})"
+    )
+
+
 def start_kdocs_monitor() -> None:
     """启动金山文档状态监控"""
     _start_daemon_loop(