feat(db): prepare migrations and core CRD

assets/migrations/migrations.go

@@ -0,0 +1,62 @@
+package migrations
+
+import (
+	"embed"
+	"io/fs"
+	"iter"
+	"path"
+	"slices"
+	"strings"
+)
+
+//go:embed */*.sql
+var migrationsFS embed.FS
+
+type Script struct {
+	FileName string
+	Content  string
+}
+
+func InitScripts() iter.Seq2[Script, error] {
+	return readScripts(path.Join(".", "init-scripts"))
+}
+
+func MigrationScripts() iter.Seq2[Script, error] {
+	return readScripts(path.Join(".", "migrations"))
+}
+
+func readScripts(dir string) iter.Seq2[Script, error] {
+	return iter.Seq2[Script, error](func(yield func(Script, error) bool) {
+		files, err := migrationsFS.ReadDir(dir)
+		if err != nil {
+			yield(Script{}, err)
+			return
+		}
+
+		slices.SortFunc(files, func(a, b fs.DirEntry) int {
+			return strings.Compare(a.Name(), b.Name())
+		})
+
+		for _, file := range files {
+			if file.IsDir() {
+				continue
+			}
+
+			content, err := migrationsFS.ReadFile(path.Join(dir, file.Name()))
+			if err != nil {
+				if !yield(Script{}, err) {
+					return
+				}
+			}
+
+			s := Script{
+				FileName: file.Name(),
+				Content:  string(content),
+			}
+
+			if !yield(s, nil) {
+				return
+			}
+		}
+	})
+}