Revert "fix(vaults): batch bulk key operations to avoid query limits"

This reverts commit 7e7bc7aecf.

unshackle/vaults/SQLite.py

@@ -119,25 +119,9 @@ class SQLite(Vault):
         cursor = conn.cursor()
 
         try:
-            # Query existing KIDs in batches to avoid SQLite variable limit
-            # Try larger batch first (newer SQLite supports 32766), fall back to 500 if needed
-            existing_kids: set[str] = set()
-            kid_list = list(kid_keys.keys())
-            batch_size = 32000
-
-            i = 0
-            while i < len(kid_list):
-                batch = kid_list[i : i + batch_size]
-                placeholders = ",".join(["?"] * len(batch))
-                try:
-                    cursor.execute(f"SELECT kid FROM `{service}` WHERE kid IN ({placeholders})", batch)
-                    existing_kids.update(row[0] for row in cursor.fetchall())
-                    i += batch_size
-                except sqlite3.OperationalError as e:
-                    if "too many SQL variables" in str(e) and batch_size > 500:
-                        batch_size = 500
-                        continue
-                    raise
+            placeholders = ",".join(["?"] * len(kid_keys))
+            cursor.execute(f"SELECT kid FROM `{service}` WHERE kid IN ({placeholders})", list(kid_keys.keys()))
+            existing_kids = {row[0] for row in cursor.fetchall()}
 
             new_keys = {kid: key for kid, key in kid_keys.items() if kid not in existing_kids}