fix: resolve alembic migration cycle — unique revision ID, correct chain

The previous migration used revision 'a1b2c3d4e5f6' which was already
taken by 005_add_reset_token_to_users.py, causing a cycle. Also both
f6a7b8c9d0e1 and the new migration pointed to the same down_revision.

Fixed:
- New unique revision ID: b7c8d9e0f1a2
- down_revision points to f6a7b8c9d0e1 (current head)
- Chain: e5b2c9d1f4a8 → f6a7b8c9d0e1 → b7c8d9e0f1a2

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

alembic/versions/b7c8d9e0f1a2_set_multilingual_target_language.py

@@ -0,0 +1,54 @@
+"""Set multilingual glossaries target_language to 'multi'
+
+Revision ID: b7c8d9e0f1a2
+Revises: f6a7b8c9d0e1
+Create Date: 2026-05-31
+
+Glossary templates that were enriched with multilingual translations
+(via enrich_glossary_templates.py) contain translations for 11 languages
+(de, es, it, pt, nl, ru, ja, ko, zh, ar, fa) in each term's translations
+field. These should be marked as target_language='multi' instead of 'en'.
+
+This migration detects glossaries whose terms have multilingual translations
+and sets their target_language to 'multi'.
+"""
+
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers
+revision = "b7c8d9e0f1a2"
+down_revision = "f6a7b8c9d0e1"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Glossaries with terms containing 5+ translation keys are multilingual templates
+    # (enriched glossaries have 11 translations: de, es, it, pt, nl, ru, ja, ko, zh, ar, fa)
+    op.execute("""
+        UPDATE glossaries
+        SET target_language = 'multi'
+        WHERE id IN (
+            SELECT DISTINCT g.id
+            FROM glossaries g
+            JOIN glossary_terms gt ON gt.glossary_id = g.id
+            WHERE gt.translations IS NOT NULL
+              AND jsonb_typeof(gt.translations) = 'object'
+              AND (
+                SELECT count(*)
+                FROM jsonb_object_keys(gt.translations)
+              ) >= 5
+        )
+    """)
+
+
+def downgrade() -> None:
+    # Revert multilingual glossaries back to 'en'
+    op.execute("""
+        UPDATE glossaries
+        SET target_language = 'en'
+        WHERE target_language = 'multi'
+    """)