feat: hltb plugin

internal/db/db.go

@@ -793,3 +793,56 @@ func initDatabase(db *sql.DB) error {
 
 	return nil
 }
+
+// CacheGet retrieves a value from the cache
+func (d *Database) CacheGet(key string) (string, error) {
+	query := `
+		SELECT value
+		FROM cache
+		WHERE key = ? AND (expires_at IS NULL OR expires_at > ?)
+	`
+
+	var value string
+	err := d.db.QueryRow(query, key, time.Now()).Scan(&value)
+	if err == sql.ErrNoRows {
+		return "", ErrNotFound
+	}
+	if err != nil {
+		return "", err
+	}
+
+	return value, nil
+}
+
+// CacheSet stores a value in the cache with optional expiration
+func (d *Database) CacheSet(key, value string, expiration *time.Time) error {
+	query := `
+		INSERT OR REPLACE INTO cache (key, value, expires_at, updated_at)
+		VALUES (?, ?, ?, ?)
+	`
+
+	_, err := d.db.Exec(query, key, value, expiration, time.Now())
+	return err
+}
+
+// CacheDelete removes a value from the cache
+func (d *Database) CacheDelete(key string) error {
+	query := `
+		DELETE FROM cache
+		WHERE key = ?
+	`
+
+	_, err := d.db.Exec(query, key)
+	return err
+}
+
+// CacheCleanup removes expired cache entries
+func (d *Database) CacheCleanup() error {
+	query := `
+		DELETE FROM cache
+		WHERE expires_at IS NOT NULL AND expires_at <= ?
+	`
+
+	_, err := d.db.Exec(query, time.Now())
+	return err
+}