fix(handlers): add handlers

tests/db_smoke.rs

@@ -0,0 +1,47 @@
+use sqlx::PgPool;
+
+#[tokio::test]
+async fn db_smoke_tenants_users_roundtrip() -> Result<(), Box<dyn std::error::Error>> {
+    let database_url = match std::env::var("DATABASE_URL") {
+        Ok(v) if !v.trim().is_empty() => v,
+        _ => return Ok(()),
+    };
+
+    let pool = PgPool::connect(&database_url).await?;
+    let mut tx = pool.begin().await?;
+
+    let tenant_id: uuid::Uuid = sqlx::query_scalar(
+        r#"
+        INSERT INTO tenants (name, status, config)
+        VALUES ($1, 'active', '{}'::jsonb)
+        RETURNING id
+        "#,
+    )
+    .bind(format!("smoke-{}", uuid::Uuid::new_v4()))
+    .fetch_one(&mut *tx)
+    .await?;
+
+    let user_id: uuid::Uuid = sqlx::query_scalar(
+        r#"
+        INSERT INTO users (tenant_id, email, password_hash)
+        VALUES ($1, $2, $3)
+        RETURNING id
+        "#,
+    )
+    .bind(tenant_id)
+    .bind(format!("smoke-{}@example.com", uuid::Uuid::new_v4()))
+    .bind("hash")
+    .fetch_one(&mut *tx)
+    .await?;
+
+    let found: i64 = sqlx::query_scalar("SELECT COUNT(1) FROM users WHERE tenant_id = $1 AND id = $2")
+        .bind(tenant_id)
+        .bind(user_id)
+        .fetch_one(&mut *tx)
+        .await?;
+
+    assert_eq!(found, 1);
+    tx.rollback().await?;
+    Ok(())
+}
+