fix: prevent duplicate preview deployments on labeled PRs

apps/dokploy/__test__/deploy/github.test.ts

@@ -5,6 +5,7 @@ import {
 	extractImageTag,
 	extractImageTagFromRequest,
 } from "@/pages/api/deploy/[refreshToken]";
+import { shouldDeployPreviewDeployment } from "@/pages/api/deploy/github";
 
 describe("GitHub Webhook Skip CI", () => {
 	const mockGithubHeaders = {
@@ -436,3 +437,36 @@ describe("Docker Image Name and Tag Extraction", () => {
 		});
 	});
 });
+
+describe("Preview Deployment duplicate prevention", () => {
+	it("deploys on code-changing pull_request events", () => {
+		for (const action of ["opened", "synchronize", "reopened"]) {
+			expect(
+				shouldDeployPreviewDeployment({
+					action,
+					createdPreviewDeployment: false,
+				}),
+			).toBe(true);
+		}
+	});
+
+	it("does NOT redeploy an existing preview on label events", () => {
+		for (const action of ["labeled", "unlabeled"]) {
+			expect(
+				shouldDeployPreviewDeployment({
+					action,
+					createdPreviewDeployment: false,
+				}),
+			).toBe(false);
+		}
+	});
+
+	it("deploys on a label event only when it just created the preview", () => {
+		expect(
+			shouldDeployPreviewDeployment({
+				action: "labeled",
+				createdPreviewDeployment: true,
+			}),
+		).toBe(true);
+	});
+});

apps/dokploy/drizzle/0170_unique_preview_deployments.sql

@@ -0,0 +1,16 @@
+-- De-duplicate existing rows (keep the oldest per PR/app) before enforcing uniqueness.
+DELETE FROM "preview_deployments"
+WHERE "previewDeploymentId" IN (
+	SELECT "previewDeploymentId"
+	FROM (
+		SELECT
+			"previewDeploymentId",
+			ROW_NUMBER() OVER (
+				PARTITION BY "applicationId", "pullRequestId"
+				ORDER BY "createdAt" ASC, "previewDeploymentId" ASC
+			) AS rn
+		FROM "preview_deployments"
+	) ranked
+	WHERE ranked.rn > 1
+);--> statement-breakpoint
+ALTER TABLE "preview_deployments" ADD CONSTRAINT "preview_deployments_applicationId_pullRequestId_unique" UNIQUE("applicationId","pullRequestId");