Add the db for reactions and removals from discord

database/migrations/01-initial.sql

@@ -47,6 +47,26 @@ CREATE TABLE message (
 	FOREIGN KEY(channel_id, receiver) REFERENCES portal(channel_id, receiver) ON DELETE CASCADE
 );
 
+CREATE TABLE reaction (
+	channel_id TEXT NOT NULL,
+	receiver TEXT NOT NULL,
+
+	discord_message_id TEXT NOT NULL,
+	matrix_event_id TEXT NOT NULL UNIQUE,
+
+	author_id TEXT NOT NULL,
+
+	matrix_name TEXT,
+	matrix_url TEXT,
+
+	discord_name TEXT,
+	discord_id TEXT,
+
+	CHECK ((discord_name IS NULL AND discord_id IS NOT NULL) OR (discord_name IS NOT NULL AND discord_id IS NULL)),
+	UNIQUE (discord_name, discord_id, author_id, discord_message_id, channel_id, receiver),
+	FOREIGN KEY(channel_id, receiver) REFERENCES portal(channel_id, receiver) ON DELETE CASCADE
+);
+
 CREATE TABLE mx_user_profile (
 	room_id     TEXT,
 	user_id     TEXT,