Refacor electron app and add migrations

electron/cqrs/commands/handlers/utils/applyUpdates.ts

@@ -0,0 +1,32 @@
+/** Converts a boolean-like value to SQLite's 0/1 integer representation. */
+export const boolToInt = (val: unknown) => (val ? 1 : 0);
+
+/** Serialises an object to a JSON string, or returns null if the value is null/undefined. */
+export const jsonOrNull = (val: unknown) => (val != null ? JSON.stringify(val) : null);
+
+/** A map of field names to transform functions that handle special serialisation. */
+export type TransformMap = Partial<Record<string, (val: unknown) => unknown>>;
+
+/**
+ * Applies a partial `updates` object onto an existing entity.
+ *
+ * - Fields absent from `updates` (undefined) are skipped entirely.
+ * - Fields listed in `transforms` are passed through their transform function first.
+ * - All other fields are written as-is, falling back to null when the value is null/undefined.
+ */
+export function applyUpdates<T extends object>(
+  entity: T,
+  updates: Partial<Record<string, unknown>>,
+  transforms: TransformMap = {}
+): void {
+  const target = entity as unknown as Record<string, unknown>;
+
+  for (const [key, value] of Object.entries(updates)) {
+    if (value === undefined)
+      continue;
+
+    const transform = transforms[key];
+
+    target[key] = transform ? transform(value) : (value ?? null);
+  }
+}