fix: seeder idempotent with firstOrCreate

Use firstOrCreate instead of create so db:seed can run safely
on container restart without duplicate key violation.

docs/01-OVERVIEW.md

@@ -0,0 +1,71 @@
+# SIDES - Project Overview
+
+## What Is SIDES?
+
+**Sabo Integrated Debris Flow Monitoring and Early Warning System (SIDES)** is a flood and debris flow early warning system for **Sungai Kupang**, Malaysia. It is operated under **Jabatan Pengairan dan Saliran (JPS)** — the Malaysian Department of Irrigation and Drainage.
+
+The system monitors rainfall, water levels, and siren activations at remote telemetry stations and presents real-time data on a web dashboard with an interactive map.
+
+## Purpose
+
+SIDES provides:
+
+- **Real-time monitoring** of hydrological and meteorological data from field stations
+- **Early warning alerts** when rainfall or water levels exceed danger thresholds
+- **Siren status tracking** for stations equipped with warning sirens
+- **Historical data analysis** with exportable reports (Excel, PDF)
+- **Push notifications** to mobile devices via Firebase Cloud Messaging (FCM)
+- **Admin management** of stations, users, and access control
+
+## Domain Context
+
+- **Location**: Sungai Kupang, Malaysia (Kedah region based on station IDs)
+- **Operator**: JPS (Department of Irrigation and Drainage), Malaysia
+- **Data source**: Remote telemetry stations transmit CSV data via FTP to a central server
+- **Data pipeline**: Python script (`autoscript/sidesdecode.py`) fetches FTP files, parses CSV, inserts into PostgreSQL, and triggers push notifications
+
+## User Roles
+
+| Role | Access Level | Description |
+|------|-------------|-------------|
+| **Public** | Unauthenticated | View dashboard map with station data |
+| **User** | `access_level = 2` | View all monitoring pages, historical data, export reports |
+| **Admin** | `access_level = 1` | Full access including station management and user management |
+
+## High-Level Architecture
+
+```
+[Telemetry Stations] --CSV/FTP--> [FTP Server (myvscada.com)]
+                                        |
+                                  [Python Script (cron)]
+                                        |
+                                        v
+[PostgreSQL Database] <--data-- [sidesdecode.py] --alert--> [Laravel API]
+                                                                |
+                                                                v
+                                                        [Firebase FCM]
+                                                                |
+                                                                v
+                                                        [Mobile Devices]
+                                                        
+[Laravel Web App] <--reads-- [PostgreSQL Database]
+        |
+        v
+[Web Browser] <--Leaflet Map, Charts, Tables-->
+```
+
+## Application Name
+
+The application is registered as **SIDES** in Laravel config (`APP_NAME=SIDES`).
+
+## Bilingual Support
+
+The application supports:
+- **English** (en) — default
+- **Bahasa Malaysia** (bm)
+
+Language files are stored in `src/lang/{en,bm}/` and toggled via `LocaleController` with session-based persistence.
+
+## Project Name Origin
+
+The repository is named `tckdev` (likely **TCK Development**), referencing the organization running the SIDES system.