feat: implement activity logging for user actions and create activities table

app/models/activity.ts

@@ -0,0 +1,57 @@
+// app/models/activity.ts
+import { DateTime } from 'luxon';
+import { belongsTo, column } from '@adonisjs/lucid/orm';
+import BaseModel from './base_model.js';
+import type { BelongsTo } from '@adonisjs/lucid/types/relations';
+import User from '#models/user';
+import { SnakeCaseNamingStrategy } from '@adonisjs/lucid/orm';
+
+export default class Activity extends BaseModel {
+     public static namingStrategy = new SnakeCaseNamingStrategy();
+    public static primaryKey = 'id';
+    public static table = 'activities';
+
+    @column({ isPrimary: true })
+    declare id: number;
+
+    @column()
+    declare type: string;
+
+    @column()
+    declare userId: number | null;
+
+    @column()
+    declare subjectType: string | null;
+
+    @column()
+    declare subjectId: number | null;
+
+    @column()
+    declare description: string;
+
+    // Manual JSON (de)serialization keeps this working on SQLite/MySQL.
+    // On Postgres json/jsonb the driver already parses — drop the `consume`
+    // JSON.parse there to avoid double-handling.
+    // @column({
+    //     prepare: (value: Record<string, any> | null) => (value ? JSON.stringify(value) : null),
+    //     consume: (value: string | null) => (value ? JSON.parse(value) : null),
+    // })
+    // declare properties: Record<string, any> | null;
+
+    @column()
+declare properties: Record<string, any> | null;
+
+    @column.dateTime({ autoCreate: true })
+    declare createdAt: DateTime;
+
+    @column.dateTime({ autoCreate: true, autoUpdate: true })
+    declare updatedAt: DateTime;
+
+    // @belongsTo(() => User)
+    // declare user: BelongsTo<typeof User>;
+
+    @belongsTo(() => User, {
+        foreignKey: 'userId',
+    })
+    declare user: BelongsTo<typeof User>;
+}