server: use postgres instead of scylla, easier to host

server/db/postgres.go

@@ -0,0 +1,27 @@
+package db
+
+import (
+	"context"
+	"log/slog"
+	"os"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+var Pool *pgxpool.Pool
+
+func InitPostgres(ctx context.Context) {
+	pool, err := pgxpool.New(ctx, os.Getenv("DATABASE_URL"))
+	if err != nil {
+		slog.Error("Failed to connect to Postgres", "error", err)
+		os.Exit(1)
+	}
+	Pool = pool
+	slog.Info("Connected to Postgres")
+}
+
+func ClosePostgres() {
+	if Pool != nil {
+		Pool.Close()
+	}
+}