saving steel script into the database

server/migrations/20250306132638_create_table_scripts.sql

@@ -4,9 +4,9 @@ CREATE TABLE table_scripts (
     table_definitions_id BIGINT NOT NULL REFERENCES table_definitions(id),
     target_column TEXT NOT NULL,
     script TEXT NOT NULL,
-    source_tables TEXT[] NOT NULL,           -- Added to track which tables are used in calculation
-    source_columns TEXT[] NOT NULL,          -- Added to track which columns are used in calculation
-    description TEXT,                        -- Optional description of what the script does
+    source_tables TEXT[],
+    source_columns TEXT[],
+    description TEXT,
     created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
     UNIQUE(table_definitions_id, target_column)
 );