diff --git a/database.py b/database.py
index dc20af9..35a11b9 100644
--- a/database.py
+++ b/database.py
@@ -43,12 +43,6 @@ CREATE TABLE IF NOT EXISTS item_types (
     UNIQUE(cid, actor_id, type, path)
 );
 
--- Add columns if they don't exist (for existing databases)
-DO $$ BEGIN
-    ALTER TABLE item_types ADD COLUMN IF NOT EXISTS filename VARCHAR(255);
-    ALTER TABLE item_types ADD COLUMN IF NOT EXISTS metadata JSONB DEFAULT '{}';
-EXCEPTION WHEN others THEN NULL;
-END $$;
 
 -- Pin reasons: one-to-many from item_types
 CREATE TABLE IF NOT EXISTS pin_reasons (
@@ -72,30 +66,6 @@ CREATE TABLE IF NOT EXISTS l2_shares (
     UNIQUE(cid, actor_id, l2_server, content_type)
 );
 
--- Add activity_id column if it doesn't exist (for existing databases)
-DO $$ BEGIN
-    ALTER TABLE l2_shares ADD COLUMN IF NOT EXISTS activity_id VARCHAR(128);
-EXCEPTION WHEN others THEN NULL;
-END $$;
-
--- Migration: rename content_hash to cid (for existing databases)
-DO $$ BEGIN
-    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'cache_items' AND column_name = 'content_hash') THEN
-        ALTER TABLE cache_items RENAME COLUMN content_hash TO cid;
-    END IF;
-    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'item_types' AND column_name = 'content_hash') THEN
-        ALTER TABLE item_types RENAME COLUMN content_hash TO cid;
-    END IF;
-    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'l2_shares' AND column_name = 'content_hash') THEN
-        ALTER TABLE l2_shares RENAME COLUMN content_hash TO cid;
-    END IF;
-    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'storage_pins' AND column_name = 'content_hash') THEN
-        ALTER TABLE storage_pins RENAME COLUMN content_hash TO cid;
-    END IF;
-    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'run_cache' AND column_name = 'output_hash') THEN
-        ALTER TABLE run_cache RENAME COLUMN output_hash TO output_cid;
-    END IF;
-END $$;
 
 -- Run cache: maps content-addressable run_id to output
 -- run_id is a hash of (sorted inputs + recipe), making runs deterministic