fix: handle Close() error returns in tests

Wrap defer Close() calls with anonymous functions to explicitly
ignore the error return value, satisfying errcheck linter.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: mpyw

e2e/database_init_test.go

@@ -24,7 +24,7 @@ func TestDatabaseInit_InlineSQL(t *testing.T) {
 	conn, err := db.Connect(cfg, configDir)
 	require.NoError(t, err)
 	require.NotNil(t, conn)
-	defer conn.Close()
+	defer func() { _ = conn.Close() }()
 
 	// Create server handler
 	mux, err := server.NewServeMux(conn, cfg, configDir)
@@ -91,7 +91,7 @@ queries:
 	conn, err := db.Connect(cfg, tmpDir)
 	require.NoError(t, err)
 	require.NotNil(t, conn)
-	defer conn.Close()
+	defer func() { _ = conn.Close() }()
 
 	// Create server handler
 	mux, err := server.NewServeMux(conn, cfg, tmpDir)

e2e/empty_body_test.go

@@ -19,7 +19,7 @@ func TestEmptyBody_AcceptsEmpty(t *testing.T) {
 	configDir, _ := filepath.Abs(".")
 	conn, err := db.Connect(cfg, configDir)
 	require.NoError(t, err)
-	defer conn.Close()
+	defer func() { _ = conn.Close() }()
 
 	mux, err := server.NewServeMux(conn, cfg, configDir)
 	require.NoError(t, err)

examples/stupid_todolist/config.yaml

@@ -67,6 +67,7 @@ mutations:
     sql: |
       INSERT INTO todos (title) VALUES (:title)
       RETURNING id, title, completed, created_at
+    delay: 500ms
     transform:
       post: |
         response.status = 201;
@@ -79,6 +80,7 @@ mutations:
     sql: |
       UPDATE todos SET title = :title, completed = :completed WHERE id = :id
       RETURNING id, title, completed, created_at
+    delay: 500ms
     transform:
       pre: |
         return {
@@ -93,6 +95,7 @@ mutations:
     method: DELETE
     path: /api/todos/{id:[0-9]+}
     sql: DELETE FROM todos WHERE id = :id
+    delay: 500ms
     transform:
       post: |
         response.status = 204;

internal/db/db_test.go

@@ -16,7 +16,7 @@ import (
 func TestExecuteInit_InlineSQL(t *testing.T) {
 	db, err := sqlx.Open("sqlite", ":memory:")
 	require.NoError(t, err)
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
 	cfg := config.Config{
 		Database: &config.DatabaseConfig{
@@ -51,7 +51,7 @@ func TestExecuteInit_SQLFiles(t *testing.T) {
 
 	db, err := sqlx.Open("sqlite", ":memory:")
 	require.NoError(t, err)
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
 	cfg := config.Config{
 		Database: &config.DatabaseConfig{
@@ -85,7 +85,7 @@ func TestExecuteInit_BothSQLAndFiles(t *testing.T) {
 
 	db, err := sqlx.Open("sqlite", ":memory:")
 	require.NoError(t, err)
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
 	cfg := config.Config{
 		Database: &config.DatabaseConfig{
@@ -110,7 +110,7 @@ func TestExecuteInit_BothSQLAndFiles(t *testing.T) {
 func TestExecuteInit_NoInit(t *testing.T) {
 	db, err := sqlx.Open("sqlite", ":memory:")
 	require.NoError(t, err)
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
 	cfg := config.Config{
 		Database: &config.DatabaseConfig{
@@ -125,7 +125,7 @@ func TestExecuteInit_NoInit(t *testing.T) {
 func TestExecuteInit_NilDatabase(t *testing.T) {
 	db, err := sqlx.Open("sqlite", ":memory:")
 	require.NoError(t, err)
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
 	cfg := config.Config{}
 
@@ -136,7 +136,7 @@ func TestExecuteInit_NilDatabase(t *testing.T) {
 func TestExecuteInit_InvalidSQL(t *testing.T) {
 	db, err := sqlx.Open("sqlite", ":memory:")
 	require.NoError(t, err)
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
 	cfg := config.Config{
 		Database: &config.DatabaseConfig{
@@ -155,7 +155,7 @@ func TestExecuteInit_InvalidSQL(t *testing.T) {
 func TestExecuteInit_MissingSQLFile(t *testing.T) {
 	db, err := sqlx.Open("sqlite", ":memory:")
 	require.NoError(t, err)
-	defer db.Close()
+	defer func() { _ = db.Close() }()
 
 	cfg := config.Config{
 		Database: &config.DatabaseConfig{