add: chat notifications

use sql_chanes/notifications_tag.sql; ignore first statement if you never used a preview commit

crates/core/src/model/auth.rs

@@ -40,10 +40,6 @@ pub struct User {
     /// External service connection details.
     #[serde(default)]
     pub connections: UserConnections,
-    /// Subscribed channels data. Each entry is a channel ID, as well as the ID of
-    /// the last message the user saw in that channel.
-    #[serde(default)]
-    pub subscriptions: HashMap<usize, usize>,
 }
 
 pub type UserConnections =
@@ -239,7 +235,6 @@ impl User {
             post_count: 0,
             request_count: 0,
             connections: HashMap::new(),
-            subscriptions: HashMap::new(),
         }
     }
 
@@ -392,6 +387,7 @@ pub struct Notification {
     pub content: String,
     pub owner: usize,
     pub read: bool,
+    pub tag: String,
 }
 
 impl Notification {
@@ -407,6 +403,7 @@ impl Notification {
             content,
             owner,
             read: false,
+            tag: String::new(),
         }
     }
 }