fix(profiles): commit the whole profile delete cascade once

delete_generations_by_profile (and the version sweep under it) committed on
their own, so a failure between the generation sweep and the profile row
left the profile listed with its history already gone. Both helpers take a
commit flag now, and delete_profile passes commit=False so the single
db.commit() at its end publishes the entire cascade. Other callers keep the
default and are unchanged.

backend/services/history.py

@@ -18,7 +18,7 @@ from .. import config
 logger = logging.getLogger(__name__)
 
 
-def _delete_generation_children(generation_id: str, db: Session) -> None:
+def _delete_generation_children(generation_id: str, db: Session, commit: bool = True) -> None:
     """Remove the rows that reference a generation, plus any version audio files.
 
     Story items and versions both point at the generation by a non-null FK.
@@ -28,7 +28,7 @@ def _delete_generation_children(generation_id: str, db: Session) -> None:
     from . import versions as versions_mod
 
     db.query(DBStoryItem).filter_by(generation_id=generation_id).delete()
-    versions_mod.delete_versions_for_generation(generation_id, db)
+    versions_mod.delete_versions_for_generation(generation_id, db, commit=commit)
 
 
 def _get_versions_for_generations(generation_ids: list[str], db: Session) -> dict:
@@ -349,6 +349,7 @@ async def delete_failed_generations(db: Session) -> int:
 async def delete_generations_by_profile(
     profile_id: str,
     db: Session,
+    commit: bool = True,
 ) -> int:
     """
     Delete all generations for a profile.
@@ -356,6 +357,9 @@ async def delete_generations_by_profile(
     Args:
         profile_id: Profile ID
         db: Database session
+        commit: Commit at the end. Pass False when the caller owns the
+            transaction (e.g. deleting the profile itself) so the whole
+            cascade lands in one commit.
 
     Returns:
         Number of generations deleted
@@ -365,7 +369,7 @@ async def delete_generations_by_profile(
     count = 0
     for generation in generations:
         # Delete associated version files and rows first
-        _delete_generation_children(generation.id, db)
+        _delete_generation_children(generation.id, db, commit=commit)
 
         # Delete audio file
         audio_path = config.resolve_storage_path(generation.audio_path)
@@ -381,7 +385,8 @@ async def delete_generations_by_profile(
         db.delete(generation)
         count += 1
 
-    db.commit()
+    if commit:
+        db.commit()
 
     return count
 

backend/services/profiles.py

@@ -440,7 +440,7 @@ async def delete_profile(
     # Generations carry a non-null FK to the profile and the history query
     # inner-joins profiles, so anything left behind here becomes a row the UI
     # can never show and a .wav in data/generations the user can never reclaim.
-    deleted_generations = await history.delete_generations_by_profile(profile_id, db)
+    deleted_generations = await history.delete_generations_by_profile(profile_id, db, commit=False)
     if deleted_generations:
         logger.info("Deleted %d generations belonging to profile %s", deleted_generations, profile_id)
 

backend/services/versions.py

@@ -187,7 +187,7 @@ def delete_version(version_id: str, db: Session) -> bool:
     return True
 
 
-def delete_versions_for_generation(generation_id: str, db: Session) -> int:
+def delete_versions_for_generation(generation_id: str, db: Session, commit: bool = True) -> int:
     """Delete all versions for a generation (used when deleting a generation).
 
     This runs as part of a wider cascade — deleting one generation, sweeping
@@ -196,6 +196,9 @@ def delete_versions_for_generation(generation_id: str, db: Session) -> int:
     strand the caller half-deleted, so the row goes regardless and the leaked
     file is logged. ``delete_version`` keeps raising, because a single
     user-initiated delete should fail loudly.
+
+    Pass ``commit=False`` when the caller owns the transaction and will commit
+    the whole cascade itself.
     """
     versions = (
         db.query(DBGenerationVersion)
@@ -214,7 +217,7 @@ def delete_versions_for_generation(generation_id: str, db: Session) -> int:
                 )
         db.delete(v)
         count += 1
-    if count > 0:
+    if count > 0 and commit:
         db.commit()
     return count