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| 1 | +# Data Model: Record Ride Page MVP |
| 2 | + |
| 3 | +**Branch**: `004-create-the-record-ride-mvp` | **Date**: 2026-03-20 |
| 4 | + |
| 5 | +## Overview |
| 6 | + |
| 7 | +This feature introduces a ride recording command/query flow and a `RideRecorded` event payload persisted via the existing outbox event mechanism. It also introduces a per-rider defaults query model for pre-filling the form. |
| 8 | + |
| 9 | +## Entities |
| 10 | + |
| 11 | +### RecordRideCommand |
| 12 | + |
| 13 | +Represents user-submitted form data sent to the API. |
| 14 | + |
| 15 | +| Field | Type | Required | Validation | Notes | |
| 16 | +|-------|------|----------|------------|-------| |
| 17 | +| riderId | integer | Yes | >= 1 | Derived from authenticated session context | |
| 18 | +| rideDateTimeLocal | string (date-time) | Yes | Valid date-time | Exact user-entered value | |
| 19 | +| miles | number | Yes | > 0 | Decimal precision up to 2 places | |
| 20 | +| rideMinutes | integer | No | > 0 when provided | Optional duration | |
| 21 | +| temperature | number | No | none | Optional ambient temperature in existing app unit | |
| 22 | + |
| 23 | +### RideRecordedEventPayload |
| 24 | + |
| 25 | +Immutable event contract stored in outbox payload JSON and used for downstream publishing. |
| 26 | + |
| 27 | +| Field | Type | Required | Description | |
| 28 | +|-------|------|----------|-------------| |
| 29 | +| eventId | string (guid) | Yes | Unique event identifier | |
| 30 | +| eventType | string | Yes | Constant `RideRecorded` | |
| 31 | +| occurredAtUtc | string (date-time) | Yes | Server timestamp for event creation | |
| 32 | +| riderId | integer | Yes | Rider identity | |
| 33 | +| rideDateTimeLocal | string (date-time) | Yes | User-entered ride date/time | |
| 34 | +| miles | number | Yes | Recorded miles | |
| 35 | +| rideMinutes | integer | No | Optional duration in minutes | |
| 36 | +| temperature | number | No | Optional temperature | |
| 37 | +| source | string | Yes | Constant `BikeTracking.Api` | |
| 38 | + |
| 39 | +### RiderRideDefaults |
| 40 | + |
| 41 | +Read model used by `GET /api/rides/defaults`. |
| 42 | + |
| 43 | +| Field | Type | Required | Description | |
| 44 | +|-------|------|----------|-------------| |
| 45 | +| hasPreviousRide | boolean | Yes | Indicates if defaults can be populated from prior ride | |
| 46 | +| defaultMiles | number | No | Last saved miles value | |
| 47 | +| defaultRideMinutes | integer | No | Last saved optional minutes | |
| 48 | +| defaultTemperature | number | No | Last saved optional temperature | |
| 49 | +| defaultRideDateTimeLocal | string (date-time) | Yes | Always current local date/time at response generation | |
| 50 | + |
| 51 | +## Relationships |
| 52 | + |
| 53 | +- One rider can produce many `RideRecorded` events. |
| 54 | +- `RiderRideDefaults` is derived from the latest `RideRecorded` event for that rider. |
| 55 | +- `RecordRideCommand` transforms into exactly one `RideRecordedEventPayload` when validation passes. |
| 56 | + |
| 57 | +## State Transitions |
| 58 | + |
| 59 | +1. Authenticated rider opens `/rides/record`. |
| 60 | +2. Frontend requests `GET /api/rides/defaults`. |
| 61 | +3. User submits `RecordRideCommand` via `POST /api/rides`. |
| 62 | +4. API validates request. |
| 63 | +5. API writes ride row and outbox `RideRecorded` payload in one transaction. |
| 64 | +6. API returns success response. |
| 65 | +7. Outbox publisher asynchronously publishes the payload. |
| 66 | + |
| 67 | +## Validation Rules |
| 68 | + |
| 69 | +### Frontend |
| 70 | + |
| 71 | +- `rideDateTimeLocal` is required. |
| 72 | +- `miles` is required and must be > 0. |
| 73 | +- `rideMinutes` is optional; when provided, must be > 0. |
| 74 | +- Failed submissions preserve user-entered values and show clear error feedback. |
| 75 | + |
| 76 | +### API |
| 77 | + |
| 78 | +- Repeat frontend numeric/date validation using request DTO validation and endpoint guards. |
| 79 | +- Reject malformed date-time or non-positive numeric values with `400`. |
| 80 | +- Ensure rider identity comes from authenticated context, not request body. |
| 81 | + |
| 82 | +### Database |
| 83 | + |
| 84 | +- Non-null constraints on required ride fields. |
| 85 | +- Check constraints for `miles > 0` and `rideMinutes > 0` when not null. |
| 86 | +- Required outbox metadata (`EventType`, payload JSON, occurrence timestamp). |
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