core (memory/migration): ignore FTS table when autogenerating script for migration:

SQLite Full-Text Search stable are not associated to Python object and can't be detected
by Alembic. To avoid the generation of unwanted drop commands, they are now ignored when
autogenerating migration scripts.

rel 364

sat/memory/migration/env.py

@@ -50,11 +50,19 @@ def run_migrations_offline():
         context.run_migrations()
 
 
+def include_name(name, type_, parent_names):
+    if type_ == "table":
+        if name.startswith("pubsub_items_fts"):
+            return False
+    return True
+
+
 def do_run_migrations(connection):
     context.configure(
         connection=connection,
         target_metadata=target_metadata,
-        render_as_batch=True
+        render_as_batch=True,
+        include_name=include_name
     )
 
     with context.begin_transaction():