diff --git a/backend/tests/api_settings_test.rs b/backend/tests/api_settings_test.rs
index 5d5b33a..63c41f5 100644
--- a/backend/tests/api_settings_test.rs
+++ b/backend/tests/api_settings_test.rs
@@ -46,7 +46,17 @@ async fn put_settings_without_auth_returns_401() {
         "max_age_days": 7,
         "categories": ["Cat"],
         "max_items_per_category": 4,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
 
     // PUT without a session cookie
@@ -121,7 +131,17 @@ async fn put_settings_with_valid_data_returns_200() {
         "max_age_days": 14,
         "categories": ["Vulnerabilites", "Patch Tuesday", "Threat Intel"],
         "max_items_per_category": 6,
-        "search_agent_behavior": "Focus on CVEs"
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "Focus on CVEs",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
 
     let (status, body) = app
@@ -167,7 +187,17 @@ async fn put_then_get_returns_updated_data() {
         "max_age_days": 30,
         "categories": ["Macro", "Finance"],
         "max_items_per_category": 10,
-        "search_agent_behavior": "Francophone sources"
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "Francophone sources",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (put_status, _) = app
         .put_with_session("/api/v1/settings", &update, &session)
@@ -207,7 +237,17 @@ async fn put_settings_empty_theme_returns_422() {
         "max_age_days": 7,
         "categories": ["Cat"],
         "max_items_per_category": 4,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status, body) = app
         .put_with_session("/api/v1/settings", &update, &session)
@@ -239,7 +279,17 @@ async fn put_settings_too_many_categories_returns_422() {
         "max_age_days": 7,
         "categories": categories,
         "max_items_per_category": 4,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status, body) = app
         .put_with_session("/api/v1/settings", &update, &session)
@@ -270,7 +320,17 @@ async fn put_settings_empty_categories_returns_422() {
         "max_age_days": 7,
         "categories": [],
         "max_items_per_category": 4,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status, body) = app
         .put_with_session("/api/v1/settings", &update, &session)
@@ -302,7 +362,17 @@ async fn put_settings_max_age_days_out_of_range_returns_422() {
         "max_age_days": 0,
         "categories": ["Cat"],
         "max_items_per_category": 4,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status, _) = app
         .put_with_session("/api/v1/settings", &update, &session)
@@ -319,7 +389,17 @@ async fn put_settings_max_age_days_out_of_range_returns_422() {
         "max_age_days": 366,
         "categories": ["Cat"],
         "max_items_per_category": 4,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status2, _) = app
         .put_with_session("/api/v1/settings", &update2, &session)
@@ -348,7 +428,17 @@ async fn put_settings_max_items_out_of_range_returns_422() {
         "max_age_days": 7,
         "categories": ["Cat"],
         "max_items_per_category": 51,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status, _) = app
         .put_with_session("/api/v1/settings", &update, &session)
@@ -385,7 +475,17 @@ async fn settings_are_per_user_isolated() {
         "max_age_days": 3,
         "categories": ["A-Category"],
         "max_items_per_category": 2,
-        "search_agent_behavior": "User A behavior"
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "User A behavior",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status_a, _) = app
         .put_with_session("/api/v1/settings", &update_a, &session_a)
@@ -398,7 +498,17 @@ async fn settings_are_per_user_isolated() {
         "max_age_days": 14,
         "categories": ["B-Category-1", "B-Category-2"],
         "max_items_per_category": 8,
-        "search_agent_behavior": "User B behavior"
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "User B behavior",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status_b, _) = app
         .put_with_session("/api/v1/settings", &update_b, &session_b)
@@ -442,7 +552,17 @@ async fn put_settings_boundary_values_succeed() {
         "max_age_days": 1,
         "categories": ["C"],
         "max_items_per_category": 1,
-        "search_agent_behavior": ""
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "",
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status, _) = app
         .put_with_session("/api/v1/settings", &update_min, &session)
@@ -456,7 +576,17 @@ async fn put_settings_boundary_values_succeed() {
         "max_age_days": 365,
         "categories": categories_max,
         "max_items_per_category": 50,
-        "search_agent_behavior": "a".repeat(2000)
+        "max_articles_per_source": 3,
+        "use_llm_for_source_links": false,
+        "use_brave_search": false,
+        "article_history_days": 90,
+        "batch_size": 5,
+        "search_agent_behavior": "a".repeat(2000),
+        "ai_provider": "",
+        "ai_model": "",
+        "ai_model_websearch": "",
+        "rate_limit_max_requests": null,
+        "rate_limit_time_window_seconds": null
     });
     let (status2, _) = app
         .put_with_session("/api/v1/settings", &update_max, &session)
diff --git a/backend/tests/api_syntheses_test.rs b/backend/tests/api_syntheses_test.rs
index 63c4e56..9cecfb7 100644
--- a/backend/tests/api_syntheses_test.rs
+++ b/backend/tests/api_syntheses_test.rs
@@ -621,7 +621,7 @@ async fn generate_pipeline_resolves_model_from_admin_config() {
     }
 
     let app = common::TestApp::new().await;
-    let (user_id, session) = app
+    let (_user_id, session) = app
         .create_authenticated_user("synth-model-resolve@example.com")
         .await;