maint: remove migration code

bot/config.py

@@ -1,38 +1,10 @@
 import json
 import os
-from database import get_patterns, add_pattern
+from database import get_patterns
 
 PATTERNS_FILE = "patterns.json"
 
 BOT_DATA_DIR = os.getenv("BOT_DATA_DIR", "/bot-data")
-MIGRATION_FLAG = os.path.join(BOT_DATA_DIR, "migration_done.flag")
-
-
-def migrate_patterns():
-    """Migrate patterns.json to the database if not already done."""
-    if os.path.exists(MIGRATION_FLAG):
-        print("Not performing migration: already done")
-        return
-
-    if not os.path.exists(PATTERNS_FILE):
-        return
-
-    try:
-        with open(PATTERNS_FILE, "r") as f:
-            patterns = json.load(f)
-    except (json.JSONDecodeError, FileNotFoundError):
-        patterns = []
-
-    for pattern in patterns:
-        add_pattern(pattern["regex"], pattern["response"])
-
-    with open(MIGRATION_FLAG, "w") as f:
-        f.write("done")
-
-    print("Migration completed: patterns.json -> Database")
-
-
-migrate_patterns()
 
 message_patterns = get_patterns()