🎉 Add webhooks rpc API

backend/src/app/migrations/sql/0085-add-webhook-table.sql

@@ -0,0 +1,25 @@
+CREATE TABLE webhook (
+  id uuid PRIMARY KEY,
+  team_id uuid NOT NULL REFERENCES team(id) ON DELETE CASCADE DEFERRABLE,
+
+  created_at timestamptz NOT NULL DEFAULT now(),
+  updated_at timestamptz NOT NULL DEFAULT now(),
+
+  uri text NOT NULL,
+  mtype text NOT NULL,
+
+  error_code text NULL,
+  error_count smallint DEFAULT 0,
+
+  is_active boolean DEFAULT true,
+  secret_key text NULL
+);
+
+ALTER TABLE webhook
+  ALTER COLUMN uri SET STORAGE external,
+  ALTER COLUMN mtype SET STORAGE external,
+  ALTER COLUMN error_code SET STORAGE external,
+  ALTER COLUMN secret_key SET STORAGE external;
+
+
+CREATE INDEX webhook__team_id__idx ON webhook (team_id);