this should do it

internal/db/db.go

@@ -5,16 +5,29 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"syscall"
 
 	_ "modernc.org/sqlite"
 )
 
-func OpenDB(path string) (*sql.DB, error) {
+type DBConfig struct {
+	JournalMode string
+	Synchronous string
+	BusyTimeout int
+}
+
+func OpenDB(path string, config *DBConfig) (*sql.DB, error) {
 	dir := filepath.Dir(path)
 	if err := os.MkdirAll(dir, 0755); err != nil {
 		return nil, fmt.Errorf("failed to create database directory: %w", err)
 	}
 
+	// Check if database file exists and get file info for diagnostics
+	var fileInfo os.FileInfo
+	if info, err := os.Stat(path); err == nil {
+		fileInfo = info
+	}
+
 	db, err := sql.Open("sqlite", path)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open database: %w", err)
@@ -22,14 +35,46 @@ func OpenDB(path string) (*sql.DB, error) {
 
 	if err := db.Ping(); err != nil {
 		db.Close()
-		return nil, fmt.Errorf("failed to ping database: %w", err)
+		
+		// Enhanced error diagnostics
+		diag := fmt.Sprintf("database path: %s", path)
+		if fileInfo != nil {
+			diag += fmt.Sprintf(", file size: %d bytes, mode: %s", fileInfo.Size(), fileInfo.Mode())
+		}
+		
+		// Check directory permissions
+		if dirInfo, err := os.Stat(dir); err == nil {
+			diag += fmt.Sprintf(", dir mode: %s", dirInfo.Mode())
+		}
+		
+		// Check if it's a file system issue
+		if pathErr, ok := err.(*os.PathError); ok {
+			if pathErr.Err == syscall.ENOSPC {
+				diag += ", filesystem full"
+			} else if pathErr.Err == syscall.EACCES {
+				diag += ", permission denied"
+			}
+		}
+		
+		return nil, fmt.Errorf("failed to ping database: %w (%s)", err, diag)
+	}
+
+	// Set default config if not provided
+	if config == nil {
+		config = &DBConfig{
+			JournalMode: "DELETE",
+			Synchronous: "FULL",
+			BusyTimeout: 10000,
+		}
 	}
 
 	pragmas := []string{
-		"PRAGMA journal_mode=WAL",
+		fmt.Sprintf("PRAGMA journal_mode=%s", config.JournalMode),
 		"PRAGMA foreign_keys=ON",
-		"PRAGMA synchronous=NORMAL",
-		"PRAGMA busy_timeout=5000",
+		fmt.Sprintf("PRAGMA synchronous=%s", config.Synchronous),
+		fmt.Sprintf("PRAGMA busy_timeout=%d", config.BusyTimeout),
+		"PRAGMA temp_store=MEMORY",
+		"PRAGMA mmap_size=268435456",
 	}
 
 	for _, pragma := range pragmas {