refac

backend/open_webui/internal/db.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import logging
 import os
+import re
 import sys
 from contextlib import asynccontextmanager, contextmanager
 from datetime import datetime, timedelta, timezone
@@ -321,6 +322,29 @@ elif 'sqlite' in SQLALCHEMY_DATABASE_URL:
 
     def _apply_sqlite_pragmas(dbapi_connection):
         """Apply all configured SQLite PRAGMAs to a raw DBAPI connection."""
+        # SQLite LIKE folds ASCII only; SQLAlchemy SQLite ILIKE compiles to lower(x) LIKE lower(?).
+        def like(pattern, value, escape=None):
+            if pattern is None or value is None:
+                return None
+
+            regex = []
+            escaped = False
+            escape = str(escape).lower() if escape is not None else None
+            for char in str(pattern).lower():
+                if escape and not escaped and char == escape:
+                    escaped = True
+                    continue
+                regex.append(
+                    '.*' if not escaped and char == '%' else '.' if not escaped and char == '_' else re.escape(char)
+                )
+                escaped = False
+            if escaped:
+                return False
+
+            return re.fullmatch(''.join(regex), str(value).lower(), re.DOTALL) is not None
+
+        dbapi_connection.create_function('like', 2, like, deterministic=True)
+        dbapi_connection.create_function('like', 3, like, deterministic=True)
         cursor = dbapi_connection.cursor()
         if DATABASE_ENABLE_SQLITE_WAL:
             cursor.execute('PRAGMA journal_mode=WAL')