Add initial Go CLI skeleton

internal/db/migrate.go

@@ -0,0 +1,50 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"embed"
+	"fmt"
+	"sort"
+)
+
+//go:embed schema/*.sql
+var schemaFS embed.FS
+
+func ApplyMigrations(ctx context.Context, db *sql.DB) error {
+	files, err := schemaFS.ReadDir("schema")
+	if err != nil {
+		return fmt.Errorf("read embedded schema directory: %w", err)
+	}
+
+	names := make([]string, 0, len(files))
+	for _, file := range files {
+		if file.IsDir() {
+			continue
+		}
+		names = append(names, file.Name())
+	}
+	sort.Strings(names)
+
+	tx, err := db.BeginTx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("begin schema transaction: %w", err)
+	}
+	defer tx.Rollback()
+
+	for _, name := range names {
+		content, err := schemaFS.ReadFile("schema/" + name)
+		if err != nil {
+			return fmt.Errorf("read embedded schema file %q: %w", name, err)
+		}
+		if _, err := tx.ExecContext(ctx, string(content)); err != nil {
+			return fmt.Errorf("apply schema file %q: %w", name, err)
+		}
+	}
+
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("commit schema transaction: %w", err)
+	}
+
+	return nil
+}