feat: mcp (#31)

* feat: add mcp connections table and related crud api

* feat: mcp-stdio api

db/migrations/0001_init.down.sql

@@ -12,6 +12,7 @@ DROP TABLE IF EXISTS bot_channel_configs;
 DROP TABLE IF EXISTS user_channel_bindings;
 DROP TABLE IF EXISTS history;
 DROP TABLE IF EXISTS conversations;
+DROP TABLE IF EXISTS mcp_connections;
 DROP TABLE IF EXISTS bot_model_configs;
 DROP TABLE IF EXISTS bot_settings;
 DROP TABLE IF EXISTS bot_members;

db/migrations/0001_init.up.sql

@@ -106,6 +106,21 @@ CREATE TABLE IF NOT EXISTS bot_model_configs (
   memory_model_id UUID REFERENCES models(id) ON DELETE SET NULL
 );
 
+CREATE TABLE IF NOT EXISTS mcp_connections (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  bot_id UUID NOT NULL REFERENCES bots(id) ON DELETE CASCADE,
+  name TEXT NOT NULL,
+  type TEXT NOT NULL,
+  config JSONB NOT NULL DEFAULT '{}'::jsonb,
+  is_active BOOLEAN NOT NULL DEFAULT true,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CONSTRAINT mcp_connections_type_check CHECK (type IN ('stdio', 'http', 'sse')),
+  CONSTRAINT mcp_connections_unique UNIQUE (bot_id, name)
+);
+
+CREATE INDEX IF NOT EXISTS idx_mcp_connections_bot_id ON mcp_connections(bot_id);
+
 CREATE TABLE IF NOT EXISTS conversations (
   id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
   bot_id UUID NOT NULL REFERENCES bots(id) ON DELETE CASCADE,

db/queries/mcp.sql

@@ -0,0 +1,30 @@
+-- name: GetMCPConnectionByID :one
+SELECT id, bot_id, name, type, config, is_active, created_at, updated_at
+FROM mcp_connections
+WHERE bot_id = $1 AND id = $2
+LIMIT 1;
+
+-- name: ListMCPConnectionsByBotID :many
+SELECT id, bot_id, name, type, config, is_active, created_at, updated_at
+FROM mcp_connections
+WHERE bot_id = $1
+ORDER BY created_at DESC;
+
+-- name: CreateMCPConnection :one
+INSERT INTO mcp_connections (bot_id, name, type, config, is_active)
+VALUES ($1, $2, $3, $4, $5)
+RETURNING id, bot_id, name, type, config, is_active, created_at, updated_at;
+
+-- name: UpdateMCPConnection :one
+UPDATE mcp_connections
+SET name = $3,
+    type = $4,
+    config = $5,
+    is_active = $6,
+    updated_at = now()
+WHERE bot_id = $1 AND id = $2
+RETURNING id, bot_id, name, type, config, is_active, created_at, updated_at;
+
+-- name: DeleteMCPConnection :exec
+DELETE FROM mcp_connections
+WHERE bot_id = $1 AND id = $2;