Use memdb for in-memory sqlite dbs.

config/config.yaml

@@ -32,7 +32,10 @@ cache:
 database:
   driver: "sqlite3"
   connection: "dbs/main.db?_journal=WAL&_timeout=5000&_fk=true"
-  testConnection: ":memory:?_journal=WAL&_timeout=5000&_fk=true"
+  # $RAND will be automatically replaced with a random value.
+  # memdb is more robust for an in-memory database rather than :memory: because the latter has the potential
+  # retain data even after you close and re-open the connection.
+  testConnection: "file:/$RAND?vfs=memdb&_timeout=1000&_fk=true"
 
 files:
   directory: "uploads"

pkg/services/container.go

@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"fmt"
 	"log/slog"
+	"math/rand"
 	"os"
 	"path"
 	"path/filepath"
@@ -241,18 +242,22 @@ func (c *Container) initTasks() {
 
 // openDB opens a database connection.
 func openDB(driver, connection string) (*sql.DB, error) {
+	if driver == "sqlite3" {
 		// Helper to automatically create the directories that the specified sqlite file
 		// should reside in, if one.
-	if driver == "sqlite3" {
 		d := strings.Split(connection, "/")
-
 		if len(d) > 1 {
-			path := strings.Join(d[:len(d)-1], "/")
+			dirpath := strings.Join(d[:len(d)-1], "/")
 
-			if err := os.MkdirAll(path, 0755); err != nil {
+			if err := os.MkdirAll(dirpath, 0755); err != nil {
 				return nil, err
 			}
 		}
+
+		// Check if a random value is required, which is often used for in-memory test databases.
+		if strings.Contains(connection, "$RAND") {
+			connection = strings.Replace(connection, "$RAND", fmt.Sprint(rand.Int()), 1)
+		}
 	}
 
 	return sql.Open(driver, connection)