| id | "58952c58-fcc1-43d8-adbc-032fe48c0d68" | String (UUID) | Unique identifier for the user | Reference specific users | Auto-generated |
| name | "Listenfield Support" | String | User's full name | Display and identification | Optional |
| phone | "+811234456789" | String | null | Contact phone number | Communication | Optional, max 25 chars |
| email | "support@listenfield.com" | String | null | Email address | Communication and account identification | Optional, max 255 chars, valid email format |
| lang | "en" | String | User's preferred language code | Internationalization and localization | Required, must be one of: "th", "en", "ja", "vi" |
| area_unit | "ha" | String | Preferred unit for area measurements | Standardize area calculations | Optional, must be one of: "m2", "rai", "ha", "ac", "10a" |
| weight_unit | "ton" | String | Preferred unit for weight measurements | Standardize weight calculations | Optional, must be one of: "ton", "kg" |
| soil_units | See "Soil Units Object" below | Object | Soil measurement unit preferences | Soil analysis standardization | Optional |
| line_id | "U4af4980629..." | String | null | LINE messenger user ID | Social integration | Optional |
| fb_user_id | "10158889162..." | String | null | Facebook user ID | Social integration | Optional |
| fcm_registration_id | "dKLO9...Xyz" | String | null | Firebase Cloud Messaging ID | Push notifications | Optional |
| slug | "divine-breeze-66" | String | URL-friendly identifier | URL routing and friendly links | Auto-generated |
| created_at | "2021-11-15T09:09:35Z" | String (ISO 8601) | Account creation timestamp | Audit trail | Auto-generated |
| updated_at | "2025-01-17T07:01:55Z" | String (ISO 8601) | Last update timestamp | Track modifications | Auto-generated |