refactor: use actors for db configuration (#1604)

Co-authored-by: Claude <noreply@anthropic.com>

backend/internal/common/internal_errors.go

@@ -0,0 +1,20 @@
+package common
+
+import (
+	"errors"
+)
+
+// ErrUnsupportedActorMethod is returned by custom actors when the invoked method isn't supported
+type ErrUnsupportedActorMethod struct {
+	Method string
+}
+
+func (e ErrUnsupportedActorMethod) Error() string {
+	return "method '" + e.Method + "' unsupported for actor invocation"
+}
+
+func (e ErrUnsupportedActorMethod) Is(target error) bool {
+	// Ignore the field method when checking if an error is of the type ErrUnsupportedActorMethod
+	_, ok := errors.AsType[ErrUnsupportedActorMethod](target)
+	return ok
+}