Add cleanup functionality for collapsed houses in HouseWorker: Implement methods to delete collapsed buyable houses and user houses, including notifications for affected users. Update SQL queries to support this new feature, enhancing house management and user experience.

src/worker/sql.rs

@@ -594,6 +594,36 @@ pub const QUERY_UPDATE_USER_HOUSE_STATE: &str = r#"
      );
 "#;
 
+// Haus-Zusammenfall: Sobald eine Komponente <= 0 ist, wird das Haus entfernt.
+// Gilt sowohl für kaufbare Häuser als auch für Häuser im Besitz.
+pub const QUERY_DELETE_COLLAPSED_BUYABLE_HOUSES: &str = r#"
+    WITH deleted AS (
+        DELETE FROM falukant_data.buyable_house
+         WHERE LEAST(
+             roof_condition,
+             floor_condition,
+             wall_condition,
+             window_condition
+         ) <= 0
+        RETURNING id
+    )
+    SELECT id AS house_id FROM deleted;
+"#;
+
+pub const QUERY_DELETE_COLLAPSED_USER_HOUSES: &str = r#"
+    WITH deleted AS (
+        DELETE FROM falukant_data.user_house
+         WHERE LEAST(
+             roof_condition,
+             floor_condition,
+             wall_condition,
+             window_condition
+         ) <= 0
+        RETURNING id, user_id
+    )
+    SELECT id AS house_id, user_id FROM deleted;
+"#;
+
 pub const QUERY_UPDATE_HOUSE_QUALITY: &str = r#"
 UPDATE falukant_data.user_house
      SET roof_condition   = GREATEST(0, LEAST(100, roof_condition + $1)),