diff --git a/backend-compliance/compliance/services/batch_dedup_runner.py b/backend-compliance/compliance/services/batch_dedup_runner.py
index c2c4447..89ccfe8 100644
--- a/backend-compliance/compliance/services/batch_dedup_runner.py
+++ b/backend-compliance/compliance/services/batch_dedup_runner.py
@@ -141,6 +141,10 @@ class BatchDedupRunner:
             except Exception as e:
                 logger.error("BatchDedup Phase 1 error on hint %s: %s", hint, e)
                 self.stats["errors"] += 1
+                try:
+                    self.db.rollback()
+                except Exception:
+                    pass
 
         logger.info(
             "BatchDedup Phase 1 done: %d masters, %d linked, %d review",
@@ -372,26 +376,32 @@ class BatchDedupRunner:
                 # Simple check: different control UUID is enough
                 if match_score > LINK_THRESHOLD:
                     # Mark the worse one as duplicate
-                    self.db.execute(text("""
-                        UPDATE canonical_controls
-                        SET release_state = 'duplicate', merged_into_uuid = CAST(:master AS uuid)
-                        WHERE id = CAST(:dup AS uuid)
-                          AND release_state != 'duplicate'
-                    """), {"master": match_uuid, "dup": uuid})
+                    try:
+                        self.db.execute(text("""
+                            UPDATE canonical_controls
+                            SET release_state = 'duplicate', merged_into_uuid = CAST(:master AS uuid)
+                            WHERE id = CAST(:dup AS uuid)
+                              AND release_state != 'duplicate'
+                        """), {"master": match_uuid, "dup": uuid})
 
-                    self.db.execute(text("""
-                        INSERT INTO control_parent_links
-                            (control_uuid, parent_control_uuid, link_type, confidence)
-                        VALUES (CAST(:cu AS uuid), CAST(:pu AS uuid), 'cross_regulation', :conf)
-                        ON CONFLICT (control_uuid, parent_control_uuid) DO NOTHING
-                    """), {"cu": match_uuid, "pu": uuid, "conf": match_score})
+                        self.db.execute(text("""
+                            INSERT INTO control_parent_links
+                                (control_uuid, parent_control_uuid, link_type, confidence)
+                            VALUES (CAST(:cu AS uuid), CAST(:pu AS uuid), 'cross_regulation', :conf)
+                            ON CONFLICT (control_uuid, parent_control_uuid) DO NOTHING
+                        """), {"cu": match_uuid, "pu": uuid, "conf": match_score})
 
-                    # Transfer parent links
-                    transferred = self._transfer_parent_links(match_uuid, uuid)
-                    self.stats["parent_links_transferred"] += transferred
+                        # Transfer parent links
+                        transferred = self._transfer_parent_links(match_uuid, uuid)
+                        self.stats["parent_links_transferred"] += transferred
 
-                    self.db.commit()
-                    cross_linked += 1
+                        self.db.commit()
+                        cross_linked += 1
+                    except Exception as e:
+                        logger.error("BatchDedup cross-group link error %s→%s: %s",
+                                     uuid, match_uuid, e)
+                        self.db.rollback()
+                        self.stats["errors"] += 1
                     break  # Only one cross-link per control
                 elif match_score > REVIEW_THRESHOLD:
                     self._write_review(
@@ -474,43 +484,55 @@ class BatchDedupRunner:
 
     async def _mark_duplicate(self, master: dict, candidate: dict, confidence: float):
         """Mark candidate as duplicate of master, transfer parent links."""
-        self.db.execute(text("""
-            UPDATE canonical_controls
-            SET release_state = 'duplicate', merged_into_uuid = CAST(:master AS uuid)
-            WHERE id = CAST(:cand AS uuid)
-        """), {"master": master["uuid"], "cand": candidate["uuid"]})
+        try:
+            self.db.execute(text("""
+                UPDATE canonical_controls
+                SET release_state = 'duplicate', merged_into_uuid = CAST(:master AS uuid)
+                WHERE id = CAST(:cand AS uuid)
+            """), {"master": master["uuid"], "cand": candidate["uuid"]})
 
-        self.db.execute(text("""
-            INSERT INTO control_parent_links
-                (control_uuid, parent_control_uuid, link_type, confidence)
-            VALUES (CAST(:master AS uuid), CAST(:cand_parent AS uuid), 'dedup_merge', :conf)
-            ON CONFLICT (control_uuid, parent_control_uuid) DO NOTHING
-        """), {"master": master["uuid"], "cand_parent": candidate["uuid"], "conf": confidence})
+            self.db.execute(text("""
+                INSERT INTO control_parent_links
+                    (control_uuid, parent_control_uuid, link_type, confidence)
+                VALUES (CAST(:master AS uuid), CAST(:cand_parent AS uuid), 'dedup_merge', :conf)
+                ON CONFLICT (control_uuid, parent_control_uuid) DO NOTHING
+            """), {"master": master["uuid"], "cand_parent": candidate["uuid"], "conf": confidence})
 
-        transferred = self._transfer_parent_links(master["uuid"], candidate["uuid"])
-        self.stats["parent_links_transferred"] += transferred
+            transferred = self._transfer_parent_links(master["uuid"], candidate["uuid"])
+            self.stats["parent_links_transferred"] += transferred
 
-        self.db.commit()
+            self.db.commit()
+        except Exception as e:
+            logger.error("BatchDedup _mark_duplicate error %s→%s: %s",
+                         candidate["uuid"], master["uuid"], e)
+            self.db.rollback()
+            raise
 
     async def _mark_duplicate_to(self, master_uuid: str, candidate: dict, confidence: float):
         """Mark candidate as duplicate of a Qdrant-matched master."""
-        self.db.execute(text("""
-            UPDATE canonical_controls
-            SET release_state = 'duplicate', merged_into_uuid = CAST(:master AS uuid)
-            WHERE id = CAST(:cand AS uuid)
-        """), {"master": master_uuid, "cand": candidate["uuid"]})
+        try:
+            self.db.execute(text("""
+                UPDATE canonical_controls
+                SET release_state = 'duplicate', merged_into_uuid = CAST(:master AS uuid)
+                WHERE id = CAST(:cand AS uuid)
+            """), {"master": master_uuid, "cand": candidate["uuid"]})
 
-        self.db.execute(text("""
-            INSERT INTO control_parent_links
-                (control_uuid, parent_control_uuid, link_type, confidence)
-            VALUES (CAST(:master AS uuid), CAST(:cand_parent AS uuid), 'dedup_merge', :conf)
-            ON CONFLICT (control_uuid, parent_control_uuid) DO NOTHING
-        """), {"master": master_uuid, "cand_parent": candidate["uuid"], "conf": confidence})
+            self.db.execute(text("""
+                INSERT INTO control_parent_links
+                    (control_uuid, parent_control_uuid, link_type, confidence)
+                VALUES (CAST(:master AS uuid), CAST(:cand_parent AS uuid), 'dedup_merge', :conf)
+                ON CONFLICT (control_uuid, parent_control_uuid) DO NOTHING
+            """), {"master": master_uuid, "cand_parent": candidate["uuid"], "conf": confidence})
 
-        transferred = self._transfer_parent_links(master_uuid, candidate["uuid"])
-        self.stats["parent_links_transferred"] += transferred
+            transferred = self._transfer_parent_links(master_uuid, candidate["uuid"])
+            self.stats["parent_links_transferred"] += transferred
 
-        self.db.commit()
+            self.db.commit()
+        except Exception as e:
+            logger.error("BatchDedup _mark_duplicate_to error %s→%s: %s",
+                         candidate["uuid"], master_uuid, e)
+            self.db.rollback()
+            raise
 
     def _transfer_parent_links(self, master_uuid: str, duplicate_uuid: str) -> int:
         """Move existing parent links from duplicate to master."""
@@ -549,26 +571,31 @@ class BatchDedupRunner:
 
     def _write_review(self, candidate: dict, matched_payload: dict, score: float):
         """Write a dedup review entry for borderline matches."""
-        self.db.execute(text("""
-            INSERT INTO control_dedup_reviews
-                (candidate_control_id, candidate_title, candidate_objective,
-                 matched_control_uuid, matched_control_id,
-                 similarity_score, dedup_stage, dedup_details)
-            VALUES (:ccid, :ct, :co, CAST(:mcu AS uuid), :mci,
-                    :ss, 'batch_dedup', :dd::jsonb)
-        """), {
-            "ccid": candidate["control_id"],
-            "ct": candidate["title"],
-            "co": candidate.get("objective", ""),
-            "mcu": matched_payload.get("control_uuid"),
-            "mci": matched_payload.get("control_id"),
-            "ss": score,
-            "dd": json.dumps({
-                "merge_group_hint": candidate.get("merge_group_hint", ""),
-                "pattern_id": candidate.get("pattern_id"),
-            }),
-        })
-        self.db.commit()
+        try:
+            self.db.execute(text("""
+                INSERT INTO control_dedup_reviews
+                    (candidate_control_id, candidate_title, candidate_objective,
+                     matched_control_uuid, matched_control_id,
+                     similarity_score, dedup_stage, dedup_details)
+                VALUES (:ccid, :ct, :co, CAST(:mcu AS uuid), :mci,
+                        :ss, 'batch_dedup', :dd::jsonb)
+            """), {
+                "ccid": candidate["control_id"],
+                "ct": candidate["title"],
+                "co": candidate.get("objective", ""),
+                "mcu": matched_payload.get("control_uuid"),
+                "mci": matched_payload.get("control_id"),
+                "ss": score,
+                "dd": json.dumps({
+                    "merge_group_hint": candidate.get("merge_group_hint", ""),
+                    "pattern_id": candidate.get("pattern_id"),
+                }),
+            })
+            self.db.commit()
+        except Exception as e:
+            logger.error("BatchDedup _write_review error: %s", e)
+            self.db.rollback()
+            raise
 
     # ── Progress ─────────────────────────────────────────────────────────