feat: add DB_TIMEZONE configuration and update logging for PostgreSQL timezone

.env.example

@@ -8,7 +8,7 @@ OPENAI_MODEL=deepseek-v4-pro
 DB_MODE=sqlite
 #DB_MODE=pgs
 DB_PATH=./data/app.db
-LOG_LEVEL=warn
+LOG_LEVEL=info
 STREAMING=true
-
+DB_TIMEZONE=Europe/Istanbul
 

config/config.go

@@ -17,6 +17,7 @@ type Config struct {
 	RequestTimeoutSeconds int
 	OpenAIModel           string // default model when client omits it
 	Streaming             bool   // enable/disable SSE streaming responses
+	DBTimezone            string // PostgreSQL session timezone (e.g. "Europe/Istanbul")
 }
 
 // Load reads environment variables and returns a populated Config.
@@ -51,6 +52,7 @@ func Load() *Config {
 
 	openAIApiKey := os.Getenv("OPENAI_KEY")
 	openAIModel := os.Getenv("OPENAI_MODEL")
+	dbTimezone := os.Getenv("DB_TIMEZONE")
 
 	streaming := true
 	if v := os.Getenv("STREAMING"); v != "" {
@@ -70,5 +72,6 @@ func Load() *Config {
 		RequestTimeoutSeconds: timeoutSec,
 		OpenAIModel:           openAIModel,
 		Streaming:             streaming,
+		DBTimezone:            dbTimezone,
 	}
 }

docs/wiki/Config.md

@@ -20,6 +20,7 @@
 | `REQUEST_TIMEOUT_SECONDS` | `30` | `RequestTimeoutSeconds` | Upstream istek zaman aşımı (saniye) |
 | `OPENAI_MODEL` | `""` | `OpenAIModel` | Varsayılan model adı (istekte model yoksa enjekte edilir) |
 | `STREAMING` | `true` | `Streaming` | SSE streaming yanıtlarını etkinleştir/devre dışı bırak (`true`/`false`) |
+| `DB_TIMEZONE` | `""` | `DBTimezone` | PostgreSQL oturum zaman dilimi (örn: `Europe/Istanbul`) |
 
 ## Önemli Detaylar
 

main.go

@@ -22,6 +22,7 @@ package main
 import (
 	"fmt"
 	"log"
+	"net/url"
 	"os"
 	"path/filepath"
 
@@ -67,7 +68,11 @@ func main() {
 			dialector = sqlite.Open(dsn)
 			dbEngine = "sqlite"
 		default:
-			dialector = postgres.Open(cfg.PostgresDSN)
+			dsn := cfg.PostgresDSN
+			if cfg.DBTimezone != "" {
+				dsn = appendQueryParam(dsn, "timezone", cfg.DBTimezone)
+			}
+			dialector = postgres.Open(dsn)
 		}
 
 		var err error
@@ -161,9 +166,27 @@ func main() {
 		log.Printf("   DB logging      : enabled")
 	}
 	log.Printf("   SSE streaming   : %v", cfg.Streaming)
+	if cfg.DBTimezone != "" {
+		log.Printf("   DB timezone     : %s", cfg.DBTimezone)
+	}
 
 	if err := app.Listen(addr); err != nil {
 		log.Fatalf("server error: %v", err)
 		os.Exit(1)
 	}
 }
+
+func appendQueryParam(dsn, key, value string) string {
+	if value == "" {
+		return dsn
+	}
+	u, err := url.Parse(dsn)
+	if err != nil {
+		log.Printf("⚠️  Failed to parse DSN for timezone: %v", err)
+		return dsn
+	}
+	q := u.Query()
+	q.Set(key, value)
+	u.RawQuery = q.Encode()
+	return u.String()
+}