Merge branch 'fix/alembic-transaction-per-migration': truthful migration logs

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

server/alembic/env.py

@@ -52,6 +52,13 @@ def run_migrations_online() -> None:
             connection=connection,
             target_metadata=target_metadata,
             compare_type=True,
+            # Each migration commits on its own. One transaction for the WHOLE
+            # run meant a crash at step N rolled back steps 1..N-1 while their
+            # "Running upgrade" lines stayed on screen claiming they ran - the
+            # 2026-08-21 outage's stamp-to-head repair trusted those lines and
+            # left production missing two tables (found 2026-08-23 when the
+            # locations import 500'd on a table that "had been created").
+            transaction_per_migration=True,
         )
         with context.begin_transaction():
             context.run_migrations()