diff --git a/alembic/versions/001_initial.py b/alembic/versions/001_initial.py
index 7cc2207..d6bdbcf 100644
--- a/alembic/versions/001_initial.py
+++ b/alembic/versions/001_initial.py
@@ -17,13 +17,8 @@ depends_on = None
 
 
 def upgrade() -> None:
-    # Enums
-    op.execute("CREATE TYPE feed_source_type AS ENUM ('rss', 'gdel-t2', 'social', 'earthquake', 'disaster', 'weather', 'fire', 'satellite')")
-    op.execute("CREATE TYPE event_source_type AS ENUM ('rss', 'gdel-t2', 'social', 'earthquake', 'disaster', 'weather', 'fire', 'satellite')")
-    op.execute("CREATE TYPE sentiment_label AS ENUM ('positive', 'neutral', 'negative')")
-    op.execute("CREATE TYPE entity_type AS ENUM ('person', 'organization', 'location', 'topic', 'asset')")
-    op.execute("CREATE TYPE alert_type AS ENUM ('entity_mention', 'sentiment_shift', 'geo_proximity', 'keyword_match', 'threshold', 'anomaly')")
-    op.execute("CREATE TYPE alert_severity AS ENUM ('low', 'medium', 'high', 'critical')")
+    # Enums are created implicitly by the sa.Enum(name=...) columns below.
+    # (Explicit CREATE TYPE here would collide with SQLAlchemy's own DDL.)
 
     # Extensions
     op.execute("CREATE EXTENSION IF NOT EXISTS postgis")