Add SQLite persistence, import-snapshot tool, and karma functionality

server/internal/store/sqlite/session.go

@@ -0,0 +1,56 @@
+package sqlite
+
+import (
+	"fmt"
+	"time"
+
+	"lunar-tear/server/internal/store"
+)
+
+func (s *SQLiteStore) CreateSession(uuid string, ttl time.Duration) (store.SessionState, error) {
+	var userId int64
+	err := s.db.QueryRow(`SELECT user_id FROM users WHERE uuid = ?`, uuid).Scan(&userId)
+	if err != nil {
+		return store.SessionState{}, store.ErrNotFound
+	}
+
+	now := s.clock()
+	sessionKey := fmt.Sprintf("session_%d_%d", userId, now.UnixNano())
+	expireAt := now.Add(ttl)
+
+	_, err = s.db.Exec(
+		`INSERT INTO sessions (session_key, user_id, uuid, expire_at) VALUES (?, ?, ?, ?)`,
+		sessionKey, userId, uuid, expireAt.Format(time.RFC3339Nano),
+	)
+	if err != nil {
+		return store.SessionState{}, fmt.Errorf("insert session: %w", err)
+	}
+
+	return store.SessionState{
+		SessionKey: sessionKey,
+		UserId:     userId,
+		Uuid:       uuid,
+		ExpireAt:   expireAt,
+	}, nil
+}
+
+func (s *SQLiteStore) ResolveUserId(sessionKey string) (int64, error) {
+	var userId int64
+	var expireStr string
+	err := s.db.QueryRow(
+		`SELECT user_id, expire_at FROM sessions WHERE session_key = ?`, sessionKey,
+	).Scan(&userId, &expireStr)
+	if err != nil {
+		return 0, store.ErrNotFound
+	}
+
+	expireAt, err := time.Parse(time.RFC3339Nano, expireStr)
+	if err != nil {
+		return 0, store.ErrNotFound
+	}
+	if s.clock().After(expireAt) {
+		return 0, store.ErrNotFound
+	}
+
+	return userId, nil
+}