sync: phase 1 backend + frontend from server

internal/db/db.go

@@ -214,4 +214,89 @@ CREATE TABLE IF NOT EXISTS webauthn_credentials (
 
 CREATE INDEX IF NOT EXISTS idx_push_subscriptions_user ON push_subscriptions(user_id);
 CREATE INDEX IF NOT EXISTS idx_webauthn_credentials_user ON webauthn_credentials(user_id);
+
+-- Direct message conversations
+CREATE TABLE IF NOT EXISTS conversations (
+	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+	type VARCHAR(16) NOT NULL DEFAULT 'dm',
+	name VARCHAR(100),
+	created_by UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS conversation_members (
+	conversation_id UUID NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
+	user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	PRIMARY KEY (conversation_id, user_id)
+);
+
+CREATE TABLE IF NOT EXISTS conversation_messages (
+	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+	conversation_id UUID NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
+	author_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	content VARCHAR(4000) NOT NULL,
+	edited_at TIMESTAMPTZ,
+	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_conversation_members_user ON conversation_members(user_id);
+CREATE INDEX IF NOT EXISTS idx_conversation_messages_conv_created ON conversation_messages(conversation_id, created_at DESC);
+
+-- Moderation
+CREATE TABLE IF NOT EXISTS bans (
+	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+	server_id UUID NOT NULL REFERENCES servers(id) ON DELETE CASCADE,
+	user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	banned_by UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	reason TEXT,
+	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+	UNIQUE (server_id, user_id)
+);
+
+CREATE TABLE IF NOT EXISTS server_mutes (
+	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+	server_id UUID NOT NULL REFERENCES servers(id) ON DELETE CASCADE,
+	user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	muted_by UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	reason TEXT,
+	expires_at TIMESTAMPTZ,
+	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+	UNIQUE (server_id, user_id)
+);
+
+CREATE INDEX IF NOT EXISTS idx_bans_server ON bans(server_id);
+CREATE INDEX IF NOT EXISTS idx_server_mutes_server ON server_mutes(server_id);
+
+-- Link embeds
+CREATE TABLE IF NOT EXISTS embeds (
+	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+	message_id UUID NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
+	url TEXT NOT NULL,
+	title TEXT,
+	description TEXT,
+	image_url TEXT,
+	site_name TEXT,
+	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_embeds_message ON embeds(message_id);
+
+-- Channel slowmode
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS slowmode_seconds INTEGER NOT NULL DEFAULT 0;
+
+-- Message full-text search
+ALTER TABLE messages ADD COLUMN IF NOT EXISTS search_vector tsvector;
+CREATE INDEX IF NOT EXISTS idx_messages_search ON messages USING GIN(search_vector);
+
+CREATE OR REPLACE FUNCTION messages_search_update() RETURNS trigger AS $$
+BEGIN
+	NEW.search_vector := to_tsvector('english', COALESCE(NEW.content, ''));
+	RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP TRIGGER IF EXISTS messages_search_trigger ON messages;
+CREATE TRIGGER messages_search_trigger
+BEFORE INSERT OR UPDATE ON messages
+FOR EACH ROW EXECUTE FUNCTION messages_search_update();
 `