Make euph_trees a table instead of a view

src/vault/euph.rs

@@ -301,6 +301,28 @@ impl EuphRequest {
             ])?;
         }
 
+        // Update euph_trees
+        tx.execute_batch(
+            "
+            DELETE FROM euph_trees;
+
+            INSERT INTO euph_trees (room, id)
+            SELECT room, id
+            FROM euph_msgs
+            WHERE parent IS NULL
+            UNION
+            SELECT room, parent
+            FROM euph_msgs
+            WHERE parent IS NOT NULL
+            AND NOT EXISTS(
+                SELECT *
+                FROM euph_msgs AS parents
+                WHERE parents.room = euph_msgs.room
+                AND parents.id = euph_msgs.parent
+            );
+            ",
+        )?;
+
         Ok(())
     }
 

src/vault/migrate.rs

@@ -60,19 +60,11 @@ fn m1(tx: &mut Transaction) -> rusqlite::Result<()> {
             CHECK (start IS NULL OR end IS NOT NULL)
         ) STRICT;
 
-        CREATE VIEW euph_trees (room, id) AS
-        SELECT room, id
-        FROM euph_msgs
-        WHERE parent IS NULL
-        UNION
-        SELECT *
-        FROM (
-            SELECT room, parent
-            FROM euph_msgs
-            WHERE parent IS NOT NULL
-            EXCEPT
-            SELECT room, id
-            FROM euph_msgs
+        CREATE TABLE euph_trees (
+            room TEXT NOT NULL,
+            id INT NOT NULL,
+
+            PRIMARY KEY (room, id)
         );
 
         CREATE INDEX euph_idx_msgs_room_id_parent