feat(backend): pg schema + store queries incl. path-keyed progress

backend/internal/db/db.go

@@ -0,0 +1,28 @@
+package db
+
+import (
+	"context"
+	_ "embed"
+	"fmt"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+//go:embed schema.sql
+var schema string
+
+func Connect(ctx context.Context, url string) (*pgxpool.Pool, error) {
+	cfg, err := pgxpool.ParseConfig(url)
+	if err != nil {
+		return nil, err
+	}
+	cfg.MaxConns = 10
+	return pgxpool.NewWithConfig(ctx, cfg)
+}
+
+func Migrate(ctx context.Context, p *pgxpool.Pool) error {
+	if _, err := p.Exec(ctx, schema); err != nil {
+		return fmt.Errorf("migrate: %w", err)
+	}
+	return nil
+}