feat: hard negative source_model tracking, training toggle

Add source_model column to hard_negatives table with migration. New
get_hard_negatives() returns full rows, delete_hard_negatives_by_ids()
for bulk deletion. get_training_data() gains use_hard_negatives param.
TrainDialog has "Use hard negatives" checkbox. Scan panel passes current
model name when marking negatives.

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

core/db.py

@@ -123,9 +123,19 @@ class ProcessedDB:
             "  filename     TEXT NOT NULL,"
             "  profile      TEXT NOT NULL DEFAULT 'default',"
             "  start_time   REAL NOT NULL,"
-            "  source_path TEXT NOT NULL DEFAULT ''"
+            "  source_path  TEXT NOT NULL DEFAULT '',"
+            "  source_model TEXT NOT NULL DEFAULT ''"
             ")"
         )
+        # Migrate: add source_model column to existing hard_negatives tables
+        hn_cols = {
+            row[1]
+            for row in self._con.execute("PRAGMA table_info(hard_negatives)").fetchall()
+        }
+        if "source_model" not in hn_cols:
+            self._con.execute(
+                "ALTER TABLE hard_negatives ADD COLUMN source_model TEXT NOT NULL DEFAULT ''"
+            )
         self._con.execute(
             "CREATE INDEX IF NOT EXISTS idx_hardneg_file_profile"
             " ON hard_negatives(filename, profile)"
@@ -353,6 +363,7 @@ class ProcessedDB:
                           negative_folder: str = "",
                           fallback_video_dir: str = "",
                           include_scan_exports: bool = False,
+                          use_hard_negatives: bool = True,
                           ) -> list[tuple[str, list[float], list[float], list[float]]]:
         """Build training video_infos from DB data.
 
@@ -362,6 +373,7 @@ class ProcessedDB:
             negative_folder: export folder name for explicit negatives (optional)
             fallback_video_dir: if source_path is empty, try filename in this dir
             include_scan_exports: if True, include auto-exported scan clips
+            use_hard_negatives: if False, skip hard negatives from scan feedback
 
         Returns:
             list of (source_video_path, positive_times, soft_times, negative_times)
@@ -400,6 +412,7 @@ class ProcessedDB:
                 soft_by_video.setdefault(fn, set()).add(st)
 
         # Include hard negatives from scan feedback
+        if use_hard_negatives:
             hard_rows = self._con.execute(
                 "SELECT filename, start_time, source_path FROM hard_negatives"
                 " WHERE profile = ?",
@@ -638,16 +651,18 @@ class ProcessedDB:
         return {r[0] for r in rows}
 
     def add_hard_negatives(self, filename: str, profile: str,
-                           times: list[float], source_path: str = "") -> None:
+                           times: list[float], source_path: str = "",
+                           source_model: str = "") -> None:
         """Save timestamps as hard-negative training examples."""
         if not self._enabled or not times:
             return
         with self._lock:
             for t in times:
                 self._con.execute(
-                    "INSERT INTO hard_negatives (filename, profile, start_time, source_path)"
+                    "INSERT INTO hard_negatives"
-                    " VALUES (?, ?, ?, ?)",
+                    " (filename, profile, start_time, source_path, source_model)"
-                    (filename, profile, t, source_path),
+                    " VALUES (?, ?, ?, ?, ?)",
+                    (filename, profile, t, source_path, source_model),
                 )
             self._con.commit()
 
@@ -662,6 +677,30 @@ class ProcessedDB:
         ).fetchall()
         return {r[0] for r in rows}
 
+    def get_hard_negatives(self, profile: str) -> list[dict]:
+        """Return all hard negatives for a profile with full details."""
+        if not self._enabled:
+            return []
+        rows = self._con.execute(
+            "SELECT id, filename, start_time, source_path, source_model"
+            " FROM hard_negatives WHERE profile = ?"
+            " ORDER BY filename, start_time",
+            (profile,),
+        ).fetchall()
+        return [{"id": r[0], "filename": r[1], "start_time": r[2],
+                 "source_path": r[3], "source_model": r[4]} for r in rows]
+
+    def delete_hard_negatives_by_ids(self, ids: list[int]) -> None:
+        """Delete hard negatives by row IDs."""
+        if not self._enabled or not ids:
+            return
+        with self._lock:
+            self._con.execute(
+                f"DELETE FROM hard_negatives WHERE id IN ({','.join('?' * len(ids))})",
+                ids,
+            )
+            self._con.commit()
+
     def remove_hard_negatives(self, filename: str, profile: str,
                               times: list[float]) -> None:
         """Remove specific hard-negative timestamps."""

main.py

@@ -372,6 +372,14 @@ class TrainDialog(QDialog):
         self._chk_scan_exports.stateChanged.connect(lambda: self._debounce.start())
         form.addRow("", self._chk_scan_exports)
 
+        self._chk_hard_negatives = QCheckBox("Use hard negatives in training")
+        self._chk_hard_negatives.setChecked(True)
+        self._chk_hard_negatives.setToolTip(
+            "When unchecked, manually marked hard negatives are excluded from training.\n"
+            "Useful when training a new model type where old negatives may not apply.")
+        self._chk_hard_negatives.stateChanged.connect(lambda: self._debounce.start())
+        form.addRow("", self._chk_hard_negatives)
+
         # Video source directory (fallback for old DB rows without source_path)
         self._txt_video_dir = QLineEdit(video_dir)
         self._txt_video_dir.setPlaceholderText("Directory containing source videos")
@@ -464,15 +472,18 @@ class TrainDialog(QDialog):
             return
         neg_folder = self._cmb_negative.currentData() or ""
         inc_scan = self._chk_scan_exports.isChecked()
+        use_neg = self._chk_hard_negatives.isChecked()
         # First check without fallback to see if source_paths are sufficient
         video_infos_no_fb = self._db.get_training_data(
             self._profile, folder, negative_folder=neg_folder,
             include_scan_exports=inc_scan,
+            use_hard_negatives=use_neg,
         )
         video_infos = self._db.get_training_data(
             self._profile, folder, negative_folder=neg_folder,
             fallback_video_dir=self._txt_video_dir.text(),
             include_scan_exports=inc_scan,
+            use_hard_negatives=use_neg,
         )
         # Show video dir field only when the fallback helps find extra videos
         needs_fallback = len(video_infos) > len(video_infos_no_fb) or len(video_infos_no_fb) == 0
@@ -526,6 +537,10 @@ class TrainDialog(QDialog):
     def include_scan_exports(self) -> bool:
         return self._chk_scan_exports.isChecked()
 
+    @property
+    def use_hard_negatives(self) -> bool:
+        return self._chk_hard_negatives.isChecked()
+
 
 class TrainWorker(QThread):
     """Trains an audio classifier off the main thread."""
@@ -4007,8 +4022,10 @@ class MainWindow(QMainWindow):
         if not self._file_path:
             return
         filename = os.path.basename(self._file_path)
+        source_model = self._scan_panel.current_model_name()
         self._db.add_hard_negatives(filename, self._profile, times,
-                                    source_path=self._file_path)
+                                    source_path=self._file_path,
+                                    source_model=source_model)
         self._timeline.set_scan_regions(
             self._scan_panel.current_regions_with_orig(),
             neg_times=self._scan_panel._neg_times,
@@ -4228,6 +4245,7 @@ class MainWindow(QMainWindow):
         embed_model = dlg.embed_model
         video_dir = dlg.video_dir
         inc_scan = dlg.include_scan_exports
+        use_neg = dlg.use_hard_negatives
         if not pos_folder:
             self._show_status("No positive class selected")
             return
@@ -4240,6 +4258,7 @@ class MainWindow(QMainWindow):
             self._profile, pos_folder, negative_folder=neg_folder,
             fallback_video_dir=video_dir,
             include_scan_exports=inc_scan,
+            use_hard_negatives=use_neg,
         )
         if not video_infos:
             self._show_status("No training data found for this subprofile")

tests/test_db.py

@@ -50,3 +50,60 @@ def test_scan_result_history():
         assert len(results.get("MODEL_A", [])) == 1
     finally:
         os.unlink(path)
+
+
+def test_hard_negatives_source_model():
+    """Hard negatives should store source_model."""
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        path = f.name
+    try:
+        db = ProcessedDB(path)
+        db.add_hard_negatives("a.mp4", "test", [10.0, 20.0],
+                              source_path="/a.mp4", source_model="HUBERT_XLARGE")
+        rows = db.get_hard_negatives("test")
+        assert len(rows) == 2
+        assert all(r["source_model"] == "HUBERT_XLARGE" for r in rows)
+    finally:
+        os.unlink(path)
+
+
+def test_training_data_skips_hard_negatives():
+    """get_training_data with use_hard_negatives=False should skip them."""
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        path = f.name
+    try:
+        db = ProcessedDB(path)
+        # Create a source file that "exists" — use the temp db file itself
+        db.add("a.mp4", 10.0, "/out/folder/g/clip.mp4", profile="test",
+               source_path=path)
+        db.add_hard_negatives("a.mp4", "test", [500.0], source_path=path)
+        # With hard negatives
+        data_with = db.get_training_data("test", "folder", use_hard_negatives=True)
+        # Without hard negatives
+        data_without = db.get_training_data("test", "folder", use_hard_negatives=False)
+        assert len(data_with) >= 1
+        # The "with" case should have the hard negative time in neg list
+        neg_with = sum(len(vi[3]) for vi in data_with)
+        neg_without = sum(len(vi[3]) for vi in data_without)
+        assert neg_with > neg_without, "hard negatives should be excluded when use_hard_negatives=False"
+    finally:
+        os.unlink(path)
+
+
+def test_delete_hard_negatives_by_ids():
+    """delete_hard_negatives_by_ids should remove specific rows."""
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        path = f.name
+    try:
+        db = ProcessedDB(path)
+        db.add_hard_negatives("a.mp4", "test", [10.0, 20.0, 30.0],
+                              source_path="/a.mp4")
+        rows = db.get_hard_negatives("test")
+        assert len(rows) == 3
+        # Delete first two
+        db.delete_hard_negatives_by_ids([rows[0]["id"], rows[1]["id"]])
+        remaining = db.get_hard_negatives("test")
+        assert len(remaining) == 1
+        assert remaining[0]["start_time"] == 30.0
+    finally:
+        os.unlink(path)