fix(zopk): Naprawa łączenia encji - brak kolumn subject_entity_id/object_entity_id

Problem: ZOPKKnowledgeFact nie ma kolumn subject_entity_id i object_entity_id.
Zamiast tego używa entities_involved (JSONB array).

Zmiany:
- get_entity_merge_preview(): użycie JSONB @> query do liczenia faktów
- merge_entities(): użycie JSONB update do zamiany entity ID w facts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

zopk_knowledge_service.py

@@ -1800,8 +1800,7 @@ def merge_entities(
 
     transfers = {
         'mentions': 0,
-        'facts_subject': 0,
+        'facts': 0,
-        'facts_object': 0,
         'relations_source': 0,
         'relations_target': 0
     }
@@ -1815,21 +1814,27 @@ def merge_entities(
         """), {'primary_id': primary_id, 'duplicate_id': duplicate_id})
         transfers['mentions'] = result.rowcount
 
-        # 2. Transfer facts (subject)
+        # 2. Transfer facts - update entities_involved JSONB
+        # Replace duplicate entity ID with primary ID in the JSONB array
         result = db_session.execute(text("""
             UPDATE zopk_knowledge_facts
-            SET subject_entity_id = :primary_id
+            SET entities_involved = (
-            WHERE subject_entity_id = :duplicate_id
+                SELECT jsonb_agg(
-        """), {'primary_id': primary_id, 'duplicate_id': duplicate_id})
+                    CASE
-        transfers['facts_subject'] = result.rowcount
+                        WHEN (elem->>'id')::int = :duplicate_id
-
+                        THEN jsonb_set(elem, '{id}', to_jsonb(:primary_id))
-        # 3. Transfer facts (object)
+                        ELSE elem
-        result = db_session.execute(text("""
+                    END
-            UPDATE zopk_knowledge_facts
+                )
-            SET object_entity_id = :primary_id
+                FROM jsonb_array_elements(entities_involved::jsonb) AS elem
-            WHERE object_entity_id = :duplicate_id
+            )
-        """), {'primary_id': primary_id, 'duplicate_id': duplicate_id})
+            WHERE entities_involved::jsonb @> :entity_json::jsonb
-        transfers['facts_object'] = result.rowcount
+        """), {
+            'primary_id': primary_id,
+            'duplicate_id': duplicate_id,
+            'entity_json': f'[{{"id": {duplicate_id}}}]'
+        })
+        transfers['facts'] = result.rowcount
 
         # 4. Transfer relations (source)
         result = db_session.execute(text("""
@@ -1907,13 +1912,12 @@ def get_entity_merge_preview(
         ZOPKKnowledgeEntityMention.entity_id == duplicate_id
     ).scalar() or 0
 
-    facts_subject = db_session.query(func.count(ZOPKKnowledgeFact.id)).filter(
+    # Facts use entities_involved (JSONB) not FK columns, so count via JSONB query
-        ZOPKKnowledgeFact.subject_entity_id == duplicate_id
+    # Count facts where duplicate entity is in entities_involved array
-    ).scalar() or 0
+    facts_with_entity = db_session.execute(text("""
-
+        SELECT COUNT(*) FROM zopk_knowledge_facts
-    facts_object = db_session.query(func.count(ZOPKKnowledgeFact.id)).filter(
+        WHERE entities_involved::jsonb @> :entity_json::jsonb
-        ZOPKKnowledgeFact.object_entity_id == duplicate_id
+    """), {'entity_json': f'[{{"id": {duplicate_id}}}]'}).scalar() or 0
-    ).scalar() or 0
 
     relations_source = db_session.query(func.count(ZOPKKnowledgeRelation.id)).filter(
         ZOPKKnowledgeRelation.source_entity_id == duplicate_id
@@ -1940,11 +1944,10 @@ def get_entity_merge_preview(
         },
         'transfers': {
             'mentions': mentions,
-            'facts_subject': facts_subject,
+            'facts': facts_with_entity,
-            'facts_object': facts_object,
             'relations_source': relations_source,
             'relations_target': relations_target,
-            'total': mentions + facts_subject + facts_object + relations_source + relations_target
+            'total': mentions + facts_with_entity + relations_source + relations_target
         },
         'result': {
             'new_mentions_count': primary.mentions_count + duplicate.mentions_count