feat: complete remaining Go backend modules

backend/internal/postgres/database.go

@@ -21,6 +21,12 @@ WITH required_table_privileges(table_name, privilege_name) AS (
     ('billing_price_rules', 'SELECT'), ('billing_price_rules', 'INSERT'), ('billing_price_rules', 'UPDATE'),
     ('billing_wallets', 'SELECT'), ('billing_wallets', 'INSERT'), ('billing_wallets', 'UPDATE'),
     ('billing_ledger', 'SELECT'), ('billing_ledger', 'INSERT')
+),
+required_generation_job_columns(column_name) AS (
+  VALUES
+    ('provider_dispatch_started_at'),
+    ('dispatch_ready_at'),
+    ('finalized_at')
 )
 SELECT
   NOT EXISTS (
@@ -29,6 +35,17 @@ SELECT
     WHERE to_regclass('public.' || table_name) IS NULL
        OR NOT has_table_privilege(current_user, 'public.' || table_name, privilege_name)
   )
+  AND NOT EXISTS (
+    SELECT 1
+    FROM required_generation_job_columns AS required_column
+    WHERE NOT EXISTS (
+      SELECT 1
+      FROM information_schema.columns
+      WHERE table_schema = 'public'
+        AND table_name = 'generation_jobs'
+        AND column_name = required_column.column_name
+    )
+  )
   AND has_function_privilege(
     current_user,
     'public.claim_generation_jobs(text,integer,integer)',