feat: improve sqlite database reliability

internal/cache/cache_test.go

@@ -1,6 +1,8 @@
 package cache
 
 import (
+	"fmt"
+	"os"
 	"testing"
 	"time"
 
@@ -8,15 +10,16 @@ import (
 )
 
 func TestCache(t *testing.T) {
-	// Create temporary database for testing
-	database, err := db.New("test_cache.db")
+	// Create temporary database for testing with unique name
+	dbFile := fmt.Sprintf("test_cache_%d.db", time.Now().UnixNano())
+	database, err := db.New(dbFile)
 	if err != nil {
 		t.Fatalf("Failed to create test database: %v", err)
 	}
 	defer func() {
 		_ = database.Close()
 		// Clean up test database file
-		// os.Remove("test_cache.db")
+		_ = os.Remove(dbFile)
 	}()
 
 	// Create cache instance
@@ -76,6 +79,9 @@ func TestCache(t *testing.T) {
 	t.Run("Exists", func(t *testing.T) {
 		existsKey := "exists_key"
 
+		// Make sure the key doesn't exist initially by deleting it
+		_ = cache.Delete(existsKey)
+
 		// Should not exist initially
 		exists, err := cache.Exists(existsKey)
 		if err != nil {

internal/db/db.go

@@ -35,6 +35,11 @@ func New(dbPath string) (*Database, error) {
 		return nil, err
 	}
 
+	// Configure SQLite for better reliability
+	if err := configureSQLite(db); err != nil {
+		return nil, err
+	}
+
 	// Initialize database
 	if err := initDatabase(db); err != nil {
 		return nil, err
@@ -794,6 +799,32 @@ func initDatabase(db *sql.DB) error {
 	return nil
 }
 
+// Configure SQLite for better reliability
+func configureSQLite(db *sql.DB) error {
+	pragmas := []string{
+		// Enable Write-Ahead Logging for better concurrency and crash recovery
+		"PRAGMA journal_mode = WAL",
+		// Set 5-second timeout when database is locked by another connection
+		"PRAGMA busy_timeout = 5000",
+		// Balance between safety and performance for disk writes
+		"PRAGMA synchronous = NORMAL",
+		// Set large cache size (1GB) for better read performance
+		"PRAGMA cache_size = 1000000000",
+		// Enable foreign key constraint enforcement
+		"PRAGMA foreign_keys = true",
+		// Store temporary tables and indices in memory for speed
+		"PRAGMA temp_store = memory",
+	}
+
+	for _, pragma := range pragmas {
+		if _, err := db.Exec(pragma); err != nil {
+			return fmt.Errorf("failed to execute %s: %w", pragma, err)
+		}
+	}
+
+	return nil
+}
+
 // CacheGet retrieves a value from the cache
 func (d *Database) CacheGet(key string) (string, error) {
 	query := `