chore: remove db migration support — fold household_id into users table definition

- Added household_id column directly to users CREATE TABLE
- Removed ALTER TABLE migration hack and Control.Exception/ScopedTypeVariables
- Renamed runMigrations to createTables (now internal, unexported)
- Tables created from scratch if database doesn't exist; no migration logic

src/Sis/Database.hs

@@ -2,7 +2,6 @@
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeFamilies #-}
 {-# LANGUAGE TypeOperators #-}
 
@@ -12,7 +11,6 @@ module Sis.Database (
     DB (..),
     runDB,
     openDatabase,
-    runMigrations,
 
     -- * DB operations (convenience wrappers)
     findUserByEmail,
@@ -37,7 +35,6 @@ module Sis.Database (
     seed,
 ) where
 
-import Control.Exception (IOException, catch)
 import Control.Monad (when)
 import Data.Maybe (fromMaybe, listToMaybe)
 import Data.Text (Text)
@@ -398,12 +395,12 @@ openDatabase path = do
     conn <- SQL.open path
     SQL.execute_ conn "PRAGMA journal_mode=WAL"
     SQL.execute_ conn "PRAGMA foreign_keys=ON"
-    runMigrations conn
+    createTables conn
     pure conn
 
 -- | Create all tables if they don't exist.
-runMigrations :: SQL.Connection -> IO ()
-runMigrations conn' = do
+createTables :: SQL.Connection -> IO ()
+createTables conn' = do
     mapM_
         (SQL.execute_ conn')
         [ "CREATE TABLE IF NOT EXISTS users (\
@@ -411,6 +408,7 @@ runMigrations conn' = do
           \ display_name TEXT NOT NULL,\
           \ email TEXT NOT NULL UNIQUE,\
           \ password_hash TEXT NOT NULL,\
+          \ household_id INTEGER REFERENCES households(id),\
           \ created_at TEXT NOT NULL DEFAULT (datetime('now')))"
         , "CREATE TABLE IF NOT EXISTS sessions (\
           \ id INTEGER PRIMARY KEY AUTOINCREMENT,\
@@ -467,9 +465,6 @@ runMigrations conn' = do
           \ expires_at TEXT NOT NULL,\
           \ created_at TEXT NOT NULL DEFAULT (datetime('now')))"
         ]
-    -- Add household_id to users (safe to re-run, ignores "duplicate column" error)
-    SQL.execute_ conn' "ALTER TABLE users ADD COLUMN household_id INTEGER REFERENCES households(id)"
-        `catch` (\(_ :: IOException) -> pure ())
 
 ----------------------------------------------------------------------
 -- Convenience wrappers (send through the DB effect)