CREATE TABLE IF NOT EXISTS "signups" (    "id" SERIAL PRIMARY KEY,    "email_address" VARCHAR NOT NULL,    "email_confirmation_code" VARCHAR(64) NOT NULL,    "email_confirmation_sent" BOOLEAN NOT NULL,    "created_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,    "device_id" VARCHAR,    "user_id" INTEGER REFERENCES users (id) ON DELETE CASCADE,    "inviting_user_id" INTEGER REFERENCES users (id) ON DELETE SET NULL,     "platform_mac" BOOLEAN NOT NULL,    "platform_linux" BOOLEAN NOT NULL,    "platform_windows" BOOLEAN NOT NULL,    "platform_unknown" BOOLEAN NOT NULL,     "editor_features" VARCHAR[],    "programming_languages" VARCHAR[]); CREATE UNIQUE INDEX "index_signups_on_email_address" ON "signups" ("email_address");CREATE INDEX "index_signups_on_email_confirmation_sent" ON "signups" ("email_confirmation_sent"); ALTER TABLE "users"    ADD "github_user_id" INTEGER; CREATE INDEX "index_users_on_email_address" ON "users" ("email_address");CREATE INDEX "index_users_on_github_user_id" ON "users" ("github_user_id");