Remove unused DB_TYPE configuration variable

.env.example

@@ -1,4 +1,3 @@
-DB_TYPE=sqlite
 DB_PATH=./data/apocapoc.db
 
 PORT=8080

README.md

@@ -9,7 +9,7 @@ Self-hosted habit tracking service with a clean, hexagonal architecture.
 - **Carry-over support**: Choose if incomplete habits persist or expire
 - **Full history tracking**: Complete audit trail of all interactions
 - **Charts & Analytics**: Heatmaps, line charts, and statistics
-- **Self-hosted first**: Easy deployment with SQLite or PostgreSQL
+- **Self-hosted first**: Easy deployment with SQLite
 
 ## Quick Start
 
@@ -24,7 +24,6 @@ services:
     ports:
       - "8080:8080"
     environment:
-      - DB_TYPE=sqlite
       - DB_PATH=/data/apocapoc.db
       - JWT_SECRET=YOUR_SECRET_HERE
       - JWT_EXPIRY=24h
@@ -69,7 +68,7 @@ The API will be available at `http://localhost:8080`
 ### Prerequisites
 
 - Go 1.23+
-- SQLite (or PostgreSQL)
+- SQLite
 
 ### Running locally
 

internal/infrastructure/config/config.go

@@ -8,7 +8,6 @@ import (
 )
 
 type Config struct {
-	DBType             string
 	DBPath             string
 	Port               string
 	Host               string
@@ -23,7 +22,6 @@ func Load() (*Config, error) {
 	godotenv.Load()
 
 	cfg := &Config{
-		DBType:             os.Getenv("DB_TYPE"),
 		DBPath:             os.Getenv("DB_PATH"),
 		Port:               getEnvOrDefault("PORT", "8080"),
 		Host:               getEnvOrDefault("HOST", "0.0.0.0"),
@@ -34,9 +32,6 @@ func Load() (*Config, error) {
 		DefaultTimezone:    os.Getenv("DEFAULT_TIMEZONE"),
 	}
 
-	if cfg.DBType == "" {
-		return nil, fmt.Errorf("DB_TYPE is required")
-	}
 	if cfg.DBPath == "" {
 		return nil, fmt.Errorf("DB_PATH is required")
 	}