refac

backend/open_webui/env.py

@@ -377,6 +377,34 @@ else:
 
 DATABASE_ENABLE_SQLITE_WAL = os.environ.get('DATABASE_ENABLE_SQLITE_WAL', 'True').lower() == 'true'
 
+# SQLite PRAGMA tuning — these defaults are optimised for WAL-mode web-server
+# workloads.  Each can be overridden via its environment variable.
+# Set any value to an empty string to skip that PRAGMA entirely.
+
+# PRAGMA synchronous: NORMAL (1) is safe with WAL and avoids an fsync per
+# transaction.  Valid values: OFF (0), NORMAL (1), FULL (2), EXTRA (3).
+DATABASE_SQLITE_PRAGMA_SYNCHRONOUS = os.environ.get('DATABASE_SQLITE_PRAGMA_SYNCHRONOUS', 'NORMAL')
+
+# PRAGMA busy_timeout (ms): how long a connection waits for a write lock
+# before raising SQLITE_BUSY.
+DATABASE_SQLITE_PRAGMA_BUSY_TIMEOUT = os.environ.get('DATABASE_SQLITE_PRAGMA_BUSY_TIMEOUT', '5000')
+
+# PRAGMA cache_size: negative value = KiB.  -65536 ≈ 64 MB page cache.
+DATABASE_SQLITE_PRAGMA_CACHE_SIZE = os.environ.get('DATABASE_SQLITE_PRAGMA_CACHE_SIZE', '-65536')
+
+# PRAGMA temp_store: MEMORY (2) keeps temp tables and indices in RAM.
+# Valid values: DEFAULT (0), FILE (1), MEMORY (2).
+DATABASE_SQLITE_PRAGMA_TEMP_STORE = os.environ.get('DATABASE_SQLITE_PRAGMA_TEMP_STORE', 'MEMORY')
+
+# PRAGMA mmap_size (bytes): memory-mapped I/O size.  268435456 ≈ 256 MB.
+# Set to 0 to disable mmap.
+DATABASE_SQLITE_PRAGMA_MMAP_SIZE = os.environ.get('DATABASE_SQLITE_PRAGMA_MMAP_SIZE', '268435456')
+
+# PRAGMA journal_size_limit (bytes): caps the WAL file size after checkpoint.
+# Without this the WAL grows unbounded during write bursts and is never
+# truncated.  67108864 ≈ 64 MB.  Set to -1 for no limit (SQLite default).
+DATABASE_SQLITE_PRAGMA_JOURNAL_SIZE_LIMIT = os.environ.get('DATABASE_SQLITE_PRAGMA_JOURNAL_SIZE_LIMIT', '67108864')
+
 DATABASE_USER_ACTIVE_STATUS_UPDATE_INTERVAL = os.environ.get('DATABASE_USER_ACTIVE_STATUS_UPDATE_INTERVAL', None)
 if DATABASE_USER_ACTIVE_STATUS_UPDATE_INTERVAL is not None:
     try:

backend/open_webui/internal/db.py

@@ -15,6 +15,12 @@ from open_webui.env import (
     DATABASE_POOL_TIMEOUT,
     DATABASE_ENABLE_SQLITE_WAL,
     DATABASE_ENABLE_SESSION_SHARING,
+    DATABASE_SQLITE_PRAGMA_SYNCHRONOUS,
+    DATABASE_SQLITE_PRAGMA_BUSY_TIMEOUT,
+    DATABASE_SQLITE_PRAGMA_CACHE_SIZE,
+    DATABASE_SQLITE_PRAGMA_TEMP_STORE,
+    DATABASE_SQLITE_PRAGMA_MMAP_SIZE,
+    DATABASE_SQLITE_PRAGMA_JOURNAL_SIZE_LIMIT,
     ENABLE_DB_MIGRATIONS,
 )
 from peewee_migrate import Router
@@ -155,14 +161,32 @@ if SQLALCHEMY_DATABASE_URL.startswith('sqlite+sqlcipher://'):
 elif 'sqlite' in SQLALCHEMY_DATABASE_URL:
     engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={'check_same_thread': False})
 
-    def on_connect(dbapi_connection, connection_record):
+    def _apply_sqlite_pragmas(dbapi_connection):
+        """Apply all configured SQLite PRAGMAs to a raw DBAPI connection."""
         cursor = dbapi_connection.cursor()
         if DATABASE_ENABLE_SQLITE_WAL:
             cursor.execute('PRAGMA journal_mode=WAL')
         else:
             cursor.execute('PRAGMA journal_mode=DELETE')
+
+        # Each PRAGMA is skipped when its env var is empty, allowing opt-out.
+        if DATABASE_SQLITE_PRAGMA_SYNCHRONOUS:
+            cursor.execute(f'PRAGMA synchronous={DATABASE_SQLITE_PRAGMA_SYNCHRONOUS}')
+        if DATABASE_SQLITE_PRAGMA_BUSY_TIMEOUT:
+            cursor.execute(f'PRAGMA busy_timeout={DATABASE_SQLITE_PRAGMA_BUSY_TIMEOUT}')
+        if DATABASE_SQLITE_PRAGMA_CACHE_SIZE:
+            cursor.execute(f'PRAGMA cache_size={DATABASE_SQLITE_PRAGMA_CACHE_SIZE}')
+        if DATABASE_SQLITE_PRAGMA_TEMP_STORE:
+            cursor.execute(f'PRAGMA temp_store={DATABASE_SQLITE_PRAGMA_TEMP_STORE}')
+        if DATABASE_SQLITE_PRAGMA_MMAP_SIZE:
+            cursor.execute(f'PRAGMA mmap_size={DATABASE_SQLITE_PRAGMA_MMAP_SIZE}')
+        if DATABASE_SQLITE_PRAGMA_JOURNAL_SIZE_LIMIT:
+            cursor.execute(f'PRAGMA journal_size_limit={DATABASE_SQLITE_PRAGMA_JOURNAL_SIZE_LIMIT}')
         cursor.close()
 
+    def on_connect(dbapi_connection, connection_record):
+        _apply_sqlite_pragmas(dbapi_connection)
+
     event.listen(engine, 'connect', on_connect)
 else:
     if isinstance(DATABASE_POOL_SIZE, int):
@@ -213,13 +237,9 @@ if 'sqlite' in ASYNC_SQLALCHEMY_DATABASE_URL:
         connect_args={'check_same_thread': False},
     )
 
-    if DATABASE_ENABLE_SQLITE_WAL:
+    @event.listens_for(async_engine.sync_engine, 'connect')
-
+    def _set_sqlite_pragmas(dbapi_connection, connection_record):
-        @event.listens_for(async_engine.sync_engine, 'connect')
+        _apply_sqlite_pragmas(dbapi_connection)
-        def _set_sqlite_wal(dbapi_connection, connection_record):
-            cursor = dbapi_connection.cursor()
-            cursor.execute('PRAGMA journal_mode=WAL')
-            cursor.close()
 else:
     if isinstance(DATABASE_POOL_SIZE, int):
         if DATABASE_POOL_SIZE > 0: