Remove blanket DEFAULTS backfill that exceeded MAX_DYNAMIC_OUTPUTS

Adding all 33 DEFAULTS keys to sequences caused the ComfyUI loader
to exceed its 32 output slot limit, triggering tuple index out of
range errors. Only lora strength migration remains on load/sync.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

utils.py

@@ -144,15 +144,6 @@ def save_snippets(snippets):
         json.dump(snippets, f, indent=4)
     os.replace(tmp, SNIPPETS_FILE)
 
-def _ensure_default_keys(data: dict) -> None:
-    """Ensure all sequences have required keys from DEFAULTS."""
-    for item in data.get(KEY_BATCH_DATA, []):
-        if not isinstance(item, dict):
-            continue
-        for k, v in DEFAULTS.items():
-            item.setdefault(k, v)
-
-
 def _migrate_lora_keys(data: dict) -> None:
     """Split legacy <lora:name:strength> values into separate name/strength keys in-place."""
     for item in data.get(KEY_BATCH_DATA, []):
@@ -189,7 +180,6 @@ def load_json(path: str | Path) -> tuple[dict[str, Any], float]:
     try:
         with open(path, 'r') as f:
             data = json.load(f)
-        _ensure_default_keys(data)
         _migrate_lora_keys(data)
         return data, path.stat().st_mtime
     except Exception as e:
@@ -253,9 +243,6 @@ def sync_to_db(db, project_name: str, file_path: Path, data: dict) -> None:
                 for item in batch_data:
                     if not isinstance(item, dict):
                         continue
-                    # Ensure all default keys are present before storing
-                    for dk, dv in DEFAULTS.items():
-                        item.setdefault(dk, dv)
                     seq_num = int(item.get(KEY_SEQUENCE_NUMBER, 0))
                     new_seq_nums.add(seq_num)
                     db.conn.execute(