Initial open source release

deploy/migrations/0040_channel_unread_mentions.up.sql

@@ -0,0 +1,25 @@
+CREATE TABLE IF NOT EXISTS channel_unread_mentions (
+    user_id        BIGINT      NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    channel_id     BIGINT      NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
+    message_id     INT         NOT NULL,
+    top_message_id INT         NOT NULL DEFAULT 0,
+    created_at     TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY (user_id, channel_id, message_id),
+    FOREIGN KEY (channel_id, message_id) REFERENCES channel_messages(channel_id, id) ON DELETE CASCADE
+) PARTITION BY HASH (user_id);
+
+CREATE INDEX IF NOT EXISTS channel_unread_mentions_peer_idx
+    ON channel_unread_mentions (user_id, channel_id, top_message_id, message_id DESC);
+
+DO $$
+DECLARE
+    i int;
+BEGIN
+    FOR i IN 0..63 LOOP
+        EXECUTE format(
+            'CREATE TABLE IF NOT EXISTS channel_unread_mentions_p%s PARTITION OF channel_unread_mentions FOR VALUES WITH (MODULUS 64, REMAINDER %s)',
+            lpad(i::text, 2, '0'),
+            i
+        );
+    END LOOP;
+END $$;