diff --git a/lib/FredyPipelineExecutioner.js b/lib/FredyPipelineExecutioner.js
index c7e79f1..5495cd2 100755
--- a/lib/FredyPipelineExecutioner.js
+++ b/lib/FredyPipelineExecutioner.js
@@ -261,7 +261,7 @@ class FredyPipelineExecutioner {
    * @returns {ParsedListing[]} Filtered listings that pass validation and provider filter.
    */
   _filter(listings) {
-    const requiredKeys = this._providerConfig.fieldNames;
+    const requiredKeys = this._providerConfig.requiredFieldNames;
     const requireValues = ['id', 'link', 'title'];
 
     const filteredListings = listings
diff --git a/lib/provider/einsAImmobilien.js b/lib/provider/einsAImmobilien.js
index dbc2d86..771ae8e 100755
--- a/lib/provider/einsAImmobilien.js
+++ b/lib/provider/einsAImmobilien.js
@@ -64,7 +64,7 @@ function applyBlacklist(o) {
 
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: '.tabelle',
   sortByDateParam: 'sort_type=newest',
diff --git a/lib/provider/immobilienDe.js b/lib/provider/immobilienDe.js
index 2de2ae1..40fbb2d 100644
--- a/lib/provider/immobilienDe.js
+++ b/lib/provider/immobilienDe.js
@@ -105,7 +105,7 @@ function applyBlacklist(o) {
 
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: 'a.lr-card',
   sortByDateParam: 'sort_col=*created_ts&sort_dir=desc',
diff --git a/lib/provider/immoscout.js b/lib/provider/immoscout.js
index 9aa0312..8eaccf3 100644
--- a/lib/provider/immoscout.js
+++ b/lib/provider/immoscout.js
@@ -202,7 +202,7 @@ function applyBlacklist(o) {
 }
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlFields: {
     id: 'id',
diff --git a/lib/provider/immoswp.js b/lib/provider/immoswp.js
index 4798df6..e01b853 100755
--- a/lib/provider/immoswp.js
+++ b/lib/provider/immoswp.js
@@ -44,7 +44,7 @@ function applyBlacklist(o) {
 
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: '.js-serp-item',
   sortByDateParam: 's=most_recently_updated_first',
diff --git a/lib/provider/immowelt.js b/lib/provider/immowelt.js
index 1e99787..38a509d 100755
--- a/lib/provider/immowelt.js
+++ b/lib/provider/immowelt.js
@@ -82,7 +82,7 @@ function applyBlacklist(o) {
 
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer:
     'div[data-testid="serp-core-scrollablelistview-testid"]:not(div[data-testid="serp-enlargementlist-testid"] div[data-testid="serp-card-testid"]) div[data-testid="serp-core-classified-card-testid"]',
diff --git a/lib/provider/kleinanzeigen.js b/lib/provider/kleinanzeigen.js
index a49542f..a132d11 100755
--- a/lib/provider/kleinanzeigen.js
+++ b/lib/provider/kleinanzeigen.js
@@ -186,7 +186,7 @@ function applyBlacklist(o) {
 
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: '#srchrslt-adtable .ad-listitem ',
   //sort by date is standard oO
diff --git a/lib/provider/mcMakler.js b/lib/provider/mcMakler.js
index 9d8ba41..3e133dd 100755
--- a/lib/provider/mcMakler.js
+++ b/lib/provider/mcMakler.js
@@ -44,7 +44,7 @@ function applyBlacklist(o) {
 }
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: 'article[data-testid="propertyCard"]',
   sortByDateParam: 'sortBy=DATE&sortOn=DESC',
diff --git a/lib/provider/neubauKompass.js b/lib/provider/neubauKompass.js
index ab05bdf..96cd5cb 100755
--- a/lib/provider/neubauKompass.js
+++ b/lib/provider/neubauKompass.js
@@ -47,7 +47,7 @@ function applyBlacklist(o) {
 
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: '.col-12.mb-4',
   sortByDateParam: 'Sortierung=Id&Richtung=DESC',
diff --git a/lib/provider/ohneMakler.js b/lib/provider/ohneMakler.js
index 9eb4603..6f8eba7 100755
--- a/lib/provider/ohneMakler.js
+++ b/lib/provider/ohneMakler.js
@@ -41,7 +41,7 @@ function applyBlacklist(o) {
 }
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: 'div[data-livecomponent-id*="search/property_list"] .grid > div',
   sortByDateParam: null,
diff --git a/lib/provider/regionalimmobilien24.js b/lib/provider/regionalimmobilien24.js
index aef3171..739cb9d 100755
--- a/lib/provider/regionalimmobilien24.js
+++ b/lib/provider/regionalimmobilien24.js
@@ -45,7 +45,7 @@ function applyBlacklist(o) {
 }
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: '.listentry-content',
   sortByDateParam: null, // sort by date is standard
diff --git a/lib/provider/sparkasse.js b/lib/provider/sparkasse.js
index 75db6e7..71c77c4 100755
--- a/lib/provider/sparkasse.js
+++ b/lib/provider/sparkasse.js
@@ -90,7 +90,7 @@ function applyBlacklist(o) {
 }
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   crawlContainer: 'div[data-testid="estate-link"]',
   sortByDateParam: 'sortBy=date_desc',
diff --git a/lib/provider/wgGesucht.js b/lib/provider/wgGesucht.js
index f355627..cf1257b 100755
--- a/lib/provider/wgGesucht.js
+++ b/lib/provider/wgGesucht.js
@@ -84,7 +84,7 @@ const config = {
     image: '.img-responsive@src',
     description: '.row .noprint .col-xs-11 |removeNewline |trim',
   },
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   normalize: normalize,
   filter: applyBlacklist,
   fetchDetails,
diff --git a/lib/provider/wohnungsboerse.js b/lib/provider/wohnungsboerse.js
index 4581029..3c24302 100644
--- a/lib/provider/wohnungsboerse.js
+++ b/lib/provider/wohnungsboerse.js
@@ -43,7 +43,7 @@ function applyBlacklist(o) {
 
 /** @type {ProviderConfig} */
 const config = {
-  fieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
+  requiredFieldNames: ['id', 'link', 'title', 'price', 'size', 'rooms', 'address', 'image', 'description'],
   url: null,
   sortByDateParam: null,
   waitForSelector: 'body',
diff --git a/lib/types/providerConfig.js b/lib/types/providerConfig.js
index 5f891f6..7b6f77f 100644
--- a/lib/types/providerConfig.js
+++ b/lib/types/providerConfig.js
@@ -11,7 +11,7 @@
  * @property {string} [sortByDateParam] Query parameter used to enforce sorting by date.
  * @property {string} [waitForSelector] CSS selector to wait for before parsing content.
  * @property {Object.<string, string>} crawlFields Mapping of field names to selectors/paths.
- * @property {string[]} fieldNames List of field names that this provider supports.
+ * @property {string[]} requiredFieldNames List of field names that this provider supports.
  * @property {string} [crawlContainer] CSS selector for the container holding listing items.
  * @property {(raw: any) => ParsedListing} normalize Function to convert raw scraped data into a ParsedListing shape.
  * @property {(listing: ParsedListing) => boolean} filter Function to filter out unwanted listings.
diff --git a/package.json b/package.json
index 464f16c..237a729 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fredy",
-  "version": "20.2.1",
+  "version": "20.3.0",
   "description": "[F]ind [R]eal [E]states [d]amn eas[y].",
   "scripts": {
     "prepare": "husky",
diff --git a/test/pipeline_filtering.test.js b/test/pipeline_filtering.test.js
index 3b624a3..2a22519 100644
--- a/test/pipeline_filtering.test.js
+++ b/test/pipeline_filtering.test.js
@@ -22,7 +22,7 @@ describe('Issue reproduction: listings filtered by similarity or area should be
       normalize: (l) => l,
       filter: () => true,
       crawlFields: { id: 'id', title: 'title', address: 'address', price: 'price' },
-      fieldNames: ['id', 'title', 'address', 'price'],
+      requiredFieldNames: ['id', 'title', 'address', 'price'],
     };
 
     const mockedJob = {
@@ -97,7 +97,7 @@ describe('Issue reproduction: listings filtered by similarity or area should be
       normalize: (l) => l,
       filter: () => true,
       crawlFields: { id: 'id', title: 'title', address: 'address', price: 'price' },
-      fieldNames: ['id', 'title', 'address', 'price'],
+      requiredFieldNames: ['id', 'title', 'address', 'price'],
     };
 
     const fredy = new Fredy(providerConfig, mockedJob, 'test-provider', mockSimilarityCache, undefined);
diff --git a/vitest.gh.config.js b/vitest.gh.config.js
index 5632320..2889fd7 100644
--- a/vitest.gh.config.js
+++ b/vitest.gh.config.js
@@ -15,6 +15,7 @@ export default mergeConfig(
         'test/provider/immonet.test.js',
         'test/provider/immobilienDe.test.js',
         'test/provider/immowelt.test.js',
+        'test/provider/sparkasse.test.js',
       ],
     },
   }),