feat: initialize independent Sense product skeleton (#21)

Sense/server/internal/platform/database.go

@@ -0,0 +1,31 @@
+package platform
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"time"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+)
+
+func OpenDatabase(ctx context.Context, cfg Config) (*sql.DB, error) {
+	if cfg.DatabaseMode == DatabaseModeMemory {
+		return nil, nil
+	}
+	database, err := sql.Open("pgx", cfg.DatabaseURL)
+	if err != nil {
+		return nil, fmt.Errorf("open Sense PostgreSQL: %w", err)
+	}
+	database.SetMaxOpenConns(20)
+	database.SetMaxIdleConns(5)
+	database.SetConnMaxLifetime(30 * time.Minute)
+
+	pingCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+	if err := database.PingContext(pingCtx); err != nil {
+		database.Close()
+		return nil, fmt.Errorf("connect Sense PostgreSQL: %w", err)
+	}
+	return database, nil
+}