add: don't allow poll creator to vote

add: unfollow user when you block them
add: force other user to unfollow you by blocking them
add: leave receiver communities when you block them

crates/core/src/database/memberships.rs

@@ -292,6 +292,32 @@ impl DataManager {
         Ok(())
     }
 
+    /// Delete a membership given its `id`
+    pub async fn delete_membership_force(&self, id: usize) -> Result<()> {
+        let y = self.get_membership_by_id(id).await?;
+
+        let conn = match self.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = execute!(
+            &conn,
+            "DELETE FROM memberships WHERE id = $1",
+            &[&(id as i64)]
+        );
+
+        if let Err(e) = res {
+            return Err(Error::DatabaseError(e.to_string()));
+        }
+
+        self.2.remove(format!("atto.membership:{}", id)).await;
+
+        self.decr_community_member_count(y.community).await.unwrap();
+
+        Ok(())
+    }
+
     /// Update a membership's role given its `id`
     pub async fn update_membership_role(
         &self,