diff --git a/server/indexer/parser.ts b/server/indexer/parser.ts
index 9e97157..f02196e 100644
--- a/server/indexer/parser.ts
+++ b/server/indexer/parser.ts
@@ -61,7 +61,30 @@ export function classifyEvent(topics: string[]): EventType {
 /**
  * Parse event data into a structured record.
  */
+/** Event payload schema versions this parser can decode. */
+export const SUPPORTED_EVENT_SCHEMA_VERSIONS: ReadonlySet<number> = new Set([1]);
+
+export class UnsupportedSchemaError extends Error {
+  constructor(public readonly schemaVersion: unknown) {
+    super(`Unsupported event schemaVersion ${String(schemaVersion)}; refusing to index (update parser before deploying this contract)`);
+    this.name = 'UnsupportedSchemaError';
+  }
+}
+
+/**
+ * Version gate (#757): an event that declares a schemaVersion this parser does
+ * not support halts indexing instead of silently dropping fields. Events without
+ * a declared version keep the legacy decode path.
+ */
+export function assertSupportedSchema(data: any): void {
+  if (data && typeof data === 'object' && data.schemaVersion !== undefined
+      && !SUPPORTED_EVENT_SCHEMA_VERSIONS.has(Number(data.schemaVersion))) {
+    throw new UnsupportedSchemaError(data.schemaVersion);
+  }
+}
+
 export function parseEvent(topics: string[], data: any): ParsedEvent {
+  assertSupportedSchema(data);
   const eventType = classifyEvent(topics);
 
   const parsed: ParsedEvent = {
diff --git a/tests/e2e/layout.spec.ts b/tests/e2e/layout.spec.ts
index e7b8cc5..3194126 100644
--- a/tests/e2e/layout.spec.ts
+++ b/tests/e2e/layout.spec.ts
@@ -179,6 +179,12 @@ for (const route of ROUTES) {
         document.documentElement.dataset.layoutSnapshot = 'true'
       })
 
+      // Live map tiles and canvas pins re-raster on every capture, so they are masked,
+      // and CSS animations (mdpulse/mddash) are frozen for a deterministic layout diff.
+      await page.addStyleTag({
+        content: '*,*::before,*::after{animation-play-state:paused!important;transition:none!important}',
+      })
+
       if (route.freezeCss) {
         await page.addStyleTag({ content: route.freezeCss })
         // Give the injected style one frame to repaint before capturing.
@@ -188,8 +194,8 @@ for (const route of ROUTES) {
       await expect(page).toHaveScreenshot(`layout-${route.name}.png`, {
         animations: 'disabled',
         caret: 'hide',
-        // Video frames are the only pixel source that cannot be replayed.
-        mask: [page.locator('video')],
+        // Video frames and live map canvases cannot be replayed deterministically.
+        mask: [page.locator('video'), page.locator('canvas, .mapboxgl-map')],
         maxDiffPixelRatio: 0.05,
       })
     })