Resolve #3514916 "Data too long"

Closes #3514916

src/ComponentIncompatibilityReasonRepository.php

@@ -40,8 +40,27 @@ final class ComponentIncompatibilityReasonRepository {
     $this->keyValue->delete($key);
   }
 
-  private function generateKey(string $source_plugin_id, string $identifier): string {
-    return \sprintf('%s:%s', $source_plugin_id, $identifier);
+  /**
+   * Generates a storage key for component incompatibility reasons.
+   *
+   * @param string $source_plugin_id
+   *   The plugin ID from which the key is derived.
+   * @param string $identifier
+   *   A unique identifier for the component.
+   *
+   * @return string
+   *   A key suitable for use in KeyValue storage.
+   */
+  protected function generateKey(string $source_plugin_id, string $identifier): string {
+    $raw_key = $source_plugin_id . ':' . $identifier;
+
+    // Hash if the key exceeds 128 characters.
+    if (strlen($raw_key) > 128) {
+      // Optionally prefix with "hash:" to distinguish hashed keys.
+      return 'hash:' . hash('sha256', $raw_key);
+    }
+
+    return $raw_key;
   }
 
   public function getReasons(): array {