feat: store layer with file CRUD

internal/store/store.go

@@ -0,0 +1,53 @@
+package store
+
+import (
+	"database/sql"
+	_ "modernc.org/sqlite"
+)
+
+type Store struct {
+	db *sql.DB
+}
+
+func Open(dbPath string) (*Store, error) {
+	db, err := sql.Open("sqlite", dbPath)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := migrate(db); err != nil {
+		db.Close()
+		return nil, err
+	}
+
+	return &Store{db: db}, nil
+}
+
+func (s *Store) Close() error {
+	return s.db.Close()
+}
+
+func migrate(db *sql.DB) error {
+	schema := `
+	CREATE TABLE IF NOT EXISTS files (
+		id            TEXT PRIMARY KEY,
+		original_name TEXT NOT NULL,
+		storage_name  TEXT NOT NULL UNIQUE,
+		dir           TEXT NOT NULL CHECK (dir IN ('inbox','outbox')),
+		size          INTEGER NOT NULL,
+		created_at    INTEGER NOT NULL
+	);
+
+	CREATE TABLE IF NOT EXISTS shares (
+		id            TEXT PRIMARY KEY,
+		file_id       TEXT NOT NULL REFERENCES files(id) ON DELETE CASCADE,
+		token         TEXT NOT NULL UNIQUE,
+		password_hash TEXT,
+		expires_at    INTEGER,
+		created_at    INTEGER NOT NULL,
+		last_accessed_at INTEGER
+	);
+	`
+	_, err := db.Exec(schema)
+	return err
+}