feat: implement core backend architecture and project management services for the History API

pkg/database/db.go

@@ -3,11 +3,23 @@ package database
 import (
 	"context"
 	"history-api/pkg/config"
+	"runtime"
 	"time"
 
 	"github.com/jackc/pgx/v5/pgxpool"
 )
 
+func defaultMaxConns() int {
+	conns := runtime.NumCPU() * 8
+	if conns < 16 {
+		return 16
+	}
+	if conns > 64 {
+		return 64
+	}
+	return conns
+}
+
 func NewPostgresqlDB() (*pgxpool.Pool, error) {
 	ctx := context.Background()
 
@@ -20,8 +32,23 @@ func NewPostgresqlDB() (*pgxpool.Pool, error) {
 	if err != nil {
 		return nil, err
 	}
-	poolConfig.MaxConns = 100
-	poolConfig.MinConns = 10
+	maxConns := config.GetIntConfigWithDefault("PGX_MAX_CONNS", defaultMaxConns())
+	if maxConns < 1 {
+		maxConns = defaultMaxConns()
+	}
+
+	minConns := config.GetIntConfigWithDefault("PGX_MIN_CONNS", maxConns/4)
+	if minConns < 0 {
+		minConns = 0
+	}
+	if minConns > maxConns {
+		minConns = maxConns
+	}
+
+	poolConfig.MaxConns = int32(maxConns)
+	poolConfig.MinConns = int32(minConns)
+	poolConfig.MaxConnIdleTime = time.Duration(config.GetIntConfigWithDefault("PGX_MAX_CONN_IDLE_SECONDS", 300)) * time.Second
+	poolConfig.HealthCheckPeriod = time.Duration(config.GetIntConfigWithDefault("PGX_HEALTH_CHECK_SECONDS", 60)) * time.Second
 
 	var pool *pgxpool.Pool