diff --git a/backend/migrations/20260403000031_add_source_rss_fields.sql b/backend/migrations/20260403000031_add_source_rss_fields.sql
new file mode 100644
index 0000000..bdc6916
--- /dev/null
+++ b/backend/migrations/20260403000031_add_source_rss_fields.sql
@@ -0,0 +1,2 @@
+ALTER TABLE sources ADD COLUMN rss_url TEXT;
+ALTER TABLE sources ADD COLUMN rss_discovered_at TIMESTAMPTZ;
diff --git a/backend/src/db/sources.rs b/backend/src/db/sources.rs
index e599d90..aab1fbf 100644
--- a/backend/src/db/sources.rs
+++ b/backend/src/db/sources.rs
@@ -3,6 +3,7 @@
 //! All queries enforce ownership isolation by including `WHERE user_id = $N`
 //! to ensure users can only access their own sources.
 
+use chrono::{DateTime, Utc};
 use sqlx::PgPool;
 use uuid::Uuid;
 
@@ -16,7 +17,7 @@ pub async fn list_for_user(pool: &PgPool, user_id: Uuid, theme_id: Option<Uuid>)
     let sources = if let Some(tid) = theme_id {
         sqlx::query_as::<_, Source>(
             r#"
-            SELECT id, user_id, title, url, theme_id, is_preferred, created_at
+            SELECT id, user_id, title, url, theme_id, is_preferred, rss_url, rss_discovered_at, created_at
             FROM sources
             WHERE user_id = $1 AND theme_id = $2
             ORDER BY created_at DESC
@@ -29,7 +30,7 @@ pub async fn list_for_user(pool: &PgPool, user_id: Uuid, theme_id: Option<Uuid>)
     } else {
         sqlx::query_as::<_, Source>(
             r#"
-            SELECT id, user_id, title, url, theme_id, is_preferred, created_at
+            SELECT id, user_id, title, url, theme_id, is_preferred, rss_url, rss_discovered_at, created_at
             FROM sources
             WHERE user_id = $1
             ORDER BY created_at DESC
@@ -58,7 +59,7 @@ pub async fn create(
         r#"
         INSERT INTO sources (user_id, title, url, theme_id)
         VALUES ($1, $2, $3, $4)
-        RETURNING id, user_id, title, url, theme_id, is_preferred, created_at
+        RETURNING id, user_id, title, url, theme_id, is_preferred, rss_url, rss_discovered_at, created_at
         "#,
     )
     .bind(user_id)
@@ -108,7 +109,7 @@ pub async fn bulk_create(
             INSERT INTO sources (user_id, title, url, theme_id)
             VALUES ($1, $2, $3, $4)
             ON CONFLICT (user_id, url) DO NOTHING
-            RETURNING id, user_id, title, url, theme_id, is_preferred, created_at
+            RETURNING id, user_id, title, url, theme_id, is_preferred, rss_url, rss_discovered_at, created_at
             "#,
         )
         .bind(user_id)
@@ -170,3 +171,25 @@ pub async fn update_preferred(
 
     Ok(())
 }
+
+/// Update the cached RSS feed URL and discovery timestamp for a source.
+///
+/// Called during synthesis generation when a feed is discovered or re-verified.
+/// Pass `rss_url = None` to clear a previously cached feed (e.g., feed no longer exists).
+pub async fn update_source_rss(
+    pool: &PgPool,
+    source_id: Uuid,
+    rss_url: Option<&str>,
+    rss_discovered_at: Option<DateTime<Utc>>,
+) -> Result<(), AppError> {
+    sqlx::query(
+        "UPDATE sources SET rss_url = $1, rss_discovered_at = $2 WHERE id = $3",
+    )
+    .bind(rss_url)
+    .bind(rss_discovered_at)
+    .bind(source_id)
+    .execute(pool)
+    .await?;
+
+    Ok(())
+}
diff --git a/backend/src/models/source.rs b/backend/src/models/source.rs
index 83d0bb4..81e74a4 100644
--- a/backend/src/models/source.rs
+++ b/backend/src/models/source.rs
@@ -16,6 +16,8 @@ pub struct Source {
     pub url: String,
     pub theme_id: Option<Uuid>,
     pub is_preferred: bool,
+    pub rss_url: Option<String>,
+    pub rss_discovered_at: Option<DateTime<Utc>>,
     pub created_at: DateTime<Utc>,
 }
 
diff --git a/backend/src/services/csv.rs b/backend/src/services/csv.rs
index 68ed8d9..c98e8e1 100644
--- a/backend/src/services/csv.rs
+++ b/backend/src/services/csv.rs
@@ -261,6 +261,8 @@ mod tests {
                 url: "https://blog.example.com".into(),
                 theme_id: None,
                 is_preferred: false,
+                rss_url: None,
+                rss_discovered_at: None,
                 created_at: Utc::now(),
             },
             Source {
@@ -270,6 +272,8 @@ mod tests {
                 url: "https://news.example.com".into(),
                 theme_id: None,
                 is_preferred: false,
+                rss_url: None,
+                rss_discovered_at: None,
                 created_at: Utc::now(),
             },
         ];
@@ -290,6 +294,8 @@ mod tests {
             url: "https://example.com".into(),
             theme_id: None,
             is_preferred: false,
+            rss_url: None,
+            rss_discovered_at: None,
             created_at: Utc::now(),
         }];
 
@@ -314,6 +320,8 @@ mod tests {
                 url: "https://blog.example.com".into(),
                 theme_id: None,
                 is_preferred: false,
+                rss_url: None,
+                rss_discovered_at: None,
                 created_at: Utc::now(),
             },
             Source {
@@ -323,6 +331,8 @@ mod tests {
                 url: "https://news.example.com".into(),
                 theme_id: None,
                 is_preferred: false,
+                rss_url: None,
+                rss_discovered_at: None,
                 created_at: Utc::now(),
             },
         ];
diff --git a/backend/src/services/prompts.rs b/backend/src/services/prompts.rs
index 45189df..45c030c 100644
--- a/backend/src/services/prompts.rs
+++ b/backend/src/services/prompts.rs
@@ -244,6 +244,8 @@ mod tests {
                 url: "https://techcrunch.com".into(),
                 theme_id: None,
                 is_preferred: false,
+                rss_url: None,
+                rss_discovered_at: None,
                 created_at: Utc::now(),
             },
             Source {
@@ -253,6 +255,8 @@ mod tests {
                 url: "https://theverge.com".into(),
                 theme_id: None,
                 is_preferred: false,
+                rss_url: None,
+                rss_discovered_at: None,
                 created_at: Utc::now(),
             },
         ];
diff --git a/backend/src/services/synthesis/mod.rs b/backend/src/services/synthesis/mod.rs
index 2c018d3..7a8245b 100644
--- a/backend/src/services/synthesis/mod.rs
+++ b/backend/src/services/synthesis/mod.rs
@@ -1231,8 +1231,8 @@ mod tests {
     #[test]
     fn rotate_sources_no_last_url() {
         let sources = vec![
-            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "A".into(), url: "https://a.com".into(), theme_id: None, is_preferred: false, created_at: chrono::Utc::now() },
-            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "B".into(), url: "https://b.com".into(), theme_id: None, is_preferred: false, created_at: chrono::Utc::now() },
+            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "A".into(), url: "https://a.com".into(), theme_id: None, is_preferred: false, rss_url: None, rss_discovered_at: None, created_at: chrono::Utc::now() },
+            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "B".into(), url: "https://b.com".into(), theme_id: None, is_preferred: false, rss_url: None, rss_discovered_at: None, created_at: chrono::Utc::now() },
         ];
         let result = rotate_sources(sources.clone(), None);
         assert_eq!(result.len(), 2);
@@ -1242,9 +1242,9 @@ mod tests {
     #[test]
     fn rotate_sources_with_last_url() {
         let sources = vec![
-            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "A".into(), url: "https://a.com".into(), theme_id: None, is_preferred: false, created_at: chrono::Utc::now() },
-            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "B".into(), url: "https://b.com".into(), theme_id: None, is_preferred: false, created_at: chrono::Utc::now() },
-            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "C".into(), url: "https://c.com".into(), theme_id: None, is_preferred: false, created_at: chrono::Utc::now() },
+            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "A".into(), url: "https://a.com".into(), theme_id: None, is_preferred: false, rss_url: None, rss_discovered_at: None, created_at: chrono::Utc::now() },
+            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "B".into(), url: "https://b.com".into(), theme_id: None, is_preferred: false, rss_url: None, rss_discovered_at: None, created_at: chrono::Utc::now() },
+            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "C".into(), url: "https://c.com".into(), theme_id: None, is_preferred: false, rss_url: None, rss_discovered_at: None, created_at: chrono::Utc::now() },
         ];
         let result = rotate_sources(sources, Some("https://a.com"));
         assert_eq!(result[0].url, "https://b.com");
@@ -1255,7 +1255,7 @@ mod tests {
     #[test]
     fn rotate_sources_last_url_not_found() {
         let sources = vec![
-            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "A".into(), url: "https://a.com".into(), theme_id: None, is_preferred: false, created_at: chrono::Utc::now() },
+            crate::models::source::Source { id: Uuid::new_v4(), user_id: Uuid::new_v4(), title: "A".into(), url: "https://a.com".into(), theme_id: None, is_preferred: false, rss_url: None, rss_discovered_at: None, created_at: chrono::Utc::now() },
         ];
         let result = rotate_sources(sources.clone(), Some("https://notfound.com"));
         assert_eq!(result[0].url, "https://a.com");