feat(server): space avatars and full member profiles in the structure response

server/src/WebDrop.Storage/SqliteChannelStore.cs

@@ -46,6 +46,7 @@ public sealed class SqliteChannelStore : IResourceStore, IDisposable
             CREATE INDEX IF NOT EXISTS ix_channel_keys_username ON channel_key_packages(username);
             CREATE TABLE IF NOT EXISTS workspace_structures (space_id BLOB PRIMARY KEY, state TEXT NOT NULL) WITHOUT ROWID;
             CREATE TABLE IF NOT EXISTS workspace_crypto (space_id BLOB PRIMARY KEY, state TEXT NOT NULL) WITHOUT ROWID;
+            CREATE TABLE IF NOT EXISTS channel_avatars (space_id BLOB PRIMARY KEY, avatar TEXT NOT NULL) WITHOUT ROWID;
             """);
     }
 
@@ -502,10 +503,19 @@ public sealed class SqliteChannelStore : IResourceStore, IDisposable
             Run("DELETE FROM channel_key_packages WHERE channel_id=@c", ("@c", key));
             Run("DELETE FROM workspace_structures WHERE space_id=@c", ("@c", key));
             Run("DELETE FROM workspace_crypto WHERE space_id=@c", ("@c", key));
+            Run("DELETE FROM channel_avatars WHERE space_id=@c", ("@c", key));
             Run("DELETE FROM channel_members WHERE channel_id=@c", ("@c", key));
             Run("DELETE FROM channel_join_denials WHERE channel_id=@c", ("@c", key));
         }
 
+        public string? GetChannelAvatar(Id16 id) => Scalar("SELECT avatar FROM channel_avatars WHERE space_id=@c", ("@c", id.ToArray())) as string;
+
+        public void SetChannelAvatar(Id16 id, string? avatar)
+        {
+            if (avatar is null) Run("DELETE FROM channel_avatars WHERE space_id=@c", ("@c", id.ToArray()));
+            else Run("INSERT INTO channel_avatars (space_id, avatar) VALUES (@c,@a) ON CONFLICT(space_id) DO UPDATE SET avatar=excluded.avatar", ("@c", id.ToArray()), ("@a", avatar));
+        }
+
         public IReadOnlyList<Id16> ListExpiredChannels(long now, int limit) =>
             Many("SELECT id FROM channels WHERE expires_at<=@now LIMIT @n", r => IdAt(r, 0), ("@now", now), ("@n", limit));