# User Points & Chat Data Protocol

This protocol defines the canonical data contract for user profile, points account, points ledger, chat session, and chat messages.

Protocol verification status:

- Last audited migration: `backend/alembic/versions/20260413_0004_register_bonus_claims_snapshot.py`
- Last audited models: `backend/src/models/profile.py`, `backend/src/models/user_points.py`, `backend/src/models/points_ledger.py`, `backend/src/models/points_audit_ledger.py`, `backend/src/models/register_bonus_claims.py`, `backend/src/models/agent_chat_session.py`, `backend/src/models/agent_chat_message.py`
- Current status: aligned with register bonus moved to application service

## Scope

- `profiles`
- `user_points`
- `points_ledger`
- `points_audit_ledger`
- `register_bonus_claims`
- `sessions`
- `messages`

## Compatibility strategy

- Current strategy: additive evolution.
- Breaking changes (drop/rename/type change on core fields) require explicit migration + rollback notes.
- `points_ledger.metadata.schema_version` is mandatory and current value is `1`.

## Runtime charging policy (chat)

- Charge unit: `20` points per successful run.
- Charge timing: deduct after worker run succeeds (`RUN_FINISHED` path).
- Failure behavior: failed/canceled runs do not deduct points.
- Precheck: before accepting a run, backend must verify `available = balance - frozen_balance >= 20`.
- Session follow-up cap: one session allows at most 2 user runs total (initial divination + 1 follow-up).
- Billing idempotency key for per-run consume: `chat.run.success:{sha1(session_id:run_id)}`.
- Failed/canceled runs do not deduct user points. If real provider cost is observed, audit record is written with `billed_to='platform'`.

## Points Change Types (change_type)

| Type | Direction | Meaning | biz_type | Description |
|------|-----------|---------|----------|-------------|
| `register` | +1 | 注册奖励 | `null` | 新用户注册赠送积分 |
| `consume` | -1 | 消费扣减 | `chat` | 用户占卜消耗积分 |
| `adjust` | ±1 | 手动调整 | `null` | 系统或管理员手动调整积分，通用调整不绑定业务场景 |
| `purchase` | +1 | 购买入账 | `payment` | 用户支付购买积分 |
| `refund` | -1 | 退款扣回 | `payment` | 退款后扣回积分 |

## Points Business Types (biz_type)

| Type | Meaning | Associated change_type |
|------|---------|------------------------|
| `chat` | 聊天/占卜业务 | `consume` |
| `payment` | 支付业务 | `purchase`, `refund` |

Note: `register` and `adjust` do not bind to any `biz_type` (they are `null`).

## Table contract

### profiles

- PK: `id` (`auth.users.id`, `on delete cascade`)
- Core fields: `username`, `avatar_url`, `bio`, `settings`, `referred_by`, `created_at`, `updated_at`, `deleted_at`
- Constraints:
  - `username` not empty
- Indexes:
  - `ix_profiles_username`
  - `ix_profiles_settings_gin`
- Notes:
  - `referred_by` is FK to `profiles.id` (`on delete set null`) for invite/referral tracking
  - `settings` stores `ProfileSettingsV1` JSON including `preferences`, `privacy`, `notification`, `divination_tutorial`

### user_points

- PK: `user_id` (`auth.users.id`, `on delete cascade`)
- Core fields: `balance`, `frozen_balance`, `lifetime_earned`, `lifetime_spent`, `version`, `created_at`, `updated_at`
- Constraints:
  - all numeric totals must be non-negative
  - `frozen_balance <= balance`

### points_ledger

- PK: `id`
- FK:
  - `user_id -> auth.users.id` (`on delete cascade`)
  - `biz_id -> sessions.id` (`on delete restrict`, nullable) — only for `biz_type='chat'`
  - `operator_id -> auth.users.id` (`on delete set null`)
- Core fields: `direction`, `amount`, `balance_after`, `change_type`, `biz_type`, `biz_id`, `event_id`, `operator_id`, `metadata`, `created_at`, `updated_at`
- Constraints:
  - `amount > 0`
  - `direction in (1, -1)`
  - `balance_after >= 0`
  - `change_type in ('register', 'consume', 'adjust', 'purchase', 'refund')`
  - `biz_type is null or biz_type in ('chat', 'payment')`
  - biz binding:
    - `register => biz_type is null and biz_id is null`
    - `consume => biz_type='chat' and biz_id not null`
    - `adjust => biz_type is null and biz_id is null` (通用调整，不绑定业务场景)
    - `purchase/refund => biz_type='payment' and biz_id not null` (biz_id references `apple_iap_transactions.id` as logical FK, not database FK)
  - direction and change_type coupling:
    - `register/purchase => direction = 1`
    - `consume/refund => direction = -1`
    - `adjust => direction in (1, -1)`
  - idempotency: `unique (user_id, event_id)`

### points_audit_ledger

- PK: `id`
- No FK to `auth.users` for `user_id_snapshot` to avoid cascade delete and preserve audit retention
- Core fields: `event_id`, `user_id_snapshot`, `user_email_snapshot`, `change_type`, `biz_type`, `biz_id`, `direction`, `amount`, `balance_after`, `billed_to`, `run_id`, `request_id`, `input_tokens`, `output_tokens`, `cost`, `metadata`, `created_at`, `updated_at`
- Constraints:
  - `amount >= 0`
  - `direction in (1, 0, -1)`
  - `balance_after >= 0`
  - `change_type in ('register', 'consume', 'adjust', 'purchase', 'refund')`
  - `biz_type is null or biz_type in ('chat', 'payment')`
  - `billed_to in ('user', 'platform')`
  - metadata must be object
  - idempotency: `unique (event_id)`

### register_bonus_claims

- PK: `id`
- Core fields: `email_hash`, `user_email_snapshot`, `first_user_id_snapshot`, `balance_snapshot`, `grant_event_id`, `has_purchased_starter_pack`, `created_at`, `updated_at`
- Constraints:
  - `email_hash` unique
  - `grant_event_id` unique
- Notes:
  - `email_hash` must be HMAC-SHA256 over normalized email (`trim + lower`)
  - key source: backend config `points_policy.register_bonus_hmac_key`
  - `balance_snapshot` stores the latest pre-delete account balance for same-email re-registration recovery
  - `has_purchased_starter_pack` tracks whether user has purchased the starter pack ($0.99/60 credits)

#### points_ledger.metadata (schema_version=1)

Canonical shape:

```json
{
  "schema_version": 1,
  "operator_type": "user|system|admin",
  "run_id": "string",
  "request_id": "string|null",
  "charge": {
    "message_id": "uuid",
    "message_seq": 1,
    "model_code": "string",
    "input_tokens": 0,
    "output_tokens": 0,
    "cost": "0.000000"
  },
  "ext": {}
}
```

JSON constraints:

- Common:
  - must be object
  - `schema_version = 1`
  - `operator_type in (user, system, admin)`
  - `run_id` non-empty
  - if present, `ext` must be object
- Per `change_type`:
  - `register`: no `charge`, and no chat binding (`biz_type/biz_id` both null)
  - `consume`: requires `charge` object with required fields
  - `adjust`: requires `ext.reason` non-empty (通用调整，系统或管理员均可操作，不绑定业务)
  - `purchase`: requires `ext.source`, `ext.platform`, `ext.product_code`, `ext.transaction_id`
  - `refund`: requires `ext.source`, `ext.platform`, `ext.product_code`, `ext.transaction_id`, `ext.original_event_id`

## Signup initialization contract

- DB trigger (`auth.users` after insert):
  - Function: `public.initialize_profile_and_invite_code_on_signup()`
  - Side effects: profile init + invite code init
- Application service (in `POST /auth/email-session`):
  - `grant_register_bonus_if_eligible()` restores `balance_snapshot` first when present; otherwise grants register bonus via `register_bonus_claims`
  - Bonus amount from `config.points_policy.register_bonus_points`

### sessions

- PK: `id`
- FK: `user_id -> auth.users.id`
- Core fields: `session_type`, `job_id`, `title`, `status`, `last_activity_at`, `message_count`, `total_tokens`, `total_cost`, `state_snapshot`, `created_at`, `updated_at`, `deleted_at`
- Constraints:
  - `session_type in ('chat', 'automation')`
  - `status in ('pending', 'running', 'completed', 'failed')`
  - `message_count/total_tokens/total_cost` non-negative

### messages

- PK: `id`
- FK: `session_id -> sessions.id` (`on delete cascade`)
- Core fields: `seq`, `role`, `content`, `model_code`, `tool_name`, `input_tokens`, `output_tokens`, `cost`, `latency_ms`, `visibility_mask`, `metadata`, `created_at`, `updated_at`, `deleted_at`
- Constraints:
  - `unique (session_id, seq)`
  - `seq > 0`
  - `role in ('user', 'assistant', 'system', 'tool')`
  - token/cost non-negative
  - `latency_ms` null or non-negative

## Security and ownership

- Backend service must derive owner identity from verified auth context.
- Client must not be trusted for `user_id`/`operator_id` ownership semantics.
- `metadata` and `settings` must not include secrets.

## Application initialization contract

Application initialization is split into two separate concerns: deterministic seed data and dynamic notification template sync. These are intentionally decoupled to avoid non-deterministic side effects during bootstrap.

### Seed data (deterministic)

Managed by `python -m core.runtime.cli init-data` (called by `dev-migrate.sh bootstrap`):

- `initialize_llm_catalog()` — seeds `llm_factory` and `llms` tables with known model definitions
- `initialize_system_agents()` — seeds `system_agents` table

These are idempotent and version-locked to code; they do not depend on runtime state or user data.

### Notification templates (declarative sync)

Managed by `python -m core.runtime.cli sync-notifications [flags]`:

- Reads notification definitions from YAML files under `backend/src/core/config/static/notification/notifications/`
- Syncs to `notifications` table; links existing users via `user_notifications` when `--reconcile-targets` is set
- Supports flags:
  - `--dry-run` — validate without writing
  - `--prune` — remove static notifications no longer present in YAML files
  - `--reconcile-targets` — insert `user_notifications` entries for all existing users matching each notification's `target` predicate
  - `--source-key <key>` — sync only the notification with the matching `source_key`

Run after migrations on fresh environments or after adding new notification YAML definitions. Not included in `bootstrap` to keep bootstrap fast and free of unintended side effects.

## Points Ledger API

### GET /api/v1/points/ledger

Returns the authenticated user's points ledger in reverse chronological order.

**Request:**
- Auth: Required (JWT)
- Query:
  - `limit`: integer, `1..100`, default `20`
  - `cursor`: optional ISO 8601 datetime returned by the previous response `nextCursor`

**Response:**
```json
{
  "items": [
    {
      "id": "9cfd5d1d-0dd8-4b30-88ce-6e4a63d22d76",
      "direction": 1,
      "amount": 60,
      "balanceAfter": 160,
      "changeType": "purchase",
      "createdAt": "2026-04-28T08:30:00+00:00"
    }
  ],
  "nextCursor": "2026-04-28T08:30:00+00:00",
  "hasMore": true
}
```

**Fields:**
- `items`: ledger rows ordered by `createdAt desc`
- `direction`: `1` for income, `-1` for spending/deduction
- `amount`: positive points delta
- `balanceAfter`: account balance after the ledger event
- `changeType`: one of `register`, `purchase`, `consume`, `adjust`, `refund`
- `createdAt`: ISO 8601 datetime for display and pagination
- `nextCursor`: last returned row `createdAt` when `hasMore=true`; otherwise `null`
- `hasMore`: whether another page is available

**Errors:**
- `POINTS_INVALID_CURSOR` (`422`): `cursor` is not a valid ISO 8601 datetime

## Packages API

### GET /api/v1/points/packages

Returns available purchase packages for the current user, including starter pack eligibility.

**Request:**
- Auth: Required (JWT)
- Headers: `Authorization: Bearer <token>`

**Response:**
```json
{
  "packages": [
    {
      "productCode": "new_user_pack",
      "appStoreProductId": "com.meeyao.qianwen.new_user_pack",
      "type": "starter",
      "credits": 60,
      "isStarter": true,
      "starterEligible": true,
      "sortOrder": 0
    },
    {
      "productCode": "starter_pack",
      "appStoreProductId": "com.meeyao.qianwen.starter_pack",
      "type": "regular",
      "credits": 100,
      "isStarter": false,
      "starterEligible": false,
      "sortOrder": 10
    }
  ]
}
```

**Fields:**
- `packages`: List of available packages
- `productCode`: Unique product identifier (e.g., `new_user_pack`, `starter_pack`, `popular_pack`, `premium_pack`)
- `appStoreProductId`: Apple App Store product identifier used for StoreKit purchase
- `type`: "starter" (new user pack) or "regular"
- `credits`: Number of credits
- `isStarter`: Whether this is a starter pack
- `starterEligible`: Whether user is eligible to purchase starter pack
- `sortOrder`: Display order (ascending)

**Business Logic:**
1. Load package mapping from `backend/src/core/config/static/packages/mapping.yaml`
2. Check starter pack eligibility:
    - If `register_bonus_claims.has_purchased_starter_pack = true`, exclude starter pack from response
    - Otherwise, include starter pack with `starterEligible: true`

**Configuration Files:**
- Path: `backend/src/core/config/static/packages/`
- Format: YAML
- Example: `mapping.yaml`

```yaml
product_mappings:
  new_user_pack:
    app_store_product_id: com.meeyao.qianwen.new_user_pack
    credits: 60
    type: starter
    sort_order: 0
    enabled: true
  starter_pack:
    app_store_product_id: com.meeyao.qianwen.starter_pack
    credits: 100
    type: regular
    sort_order: 10
    enabled: true
```

**Compatibility Note:**
- Previous protocol version documented `region` and `currency` fields that were never implemented. These have been removed from the specification.
- Strategy: `backward-compatible` — clients that expect these fields should handle their absence gracefully.