diff --git a/acceptance/bundle/resources/postgres_branches/basic/output.txt b/acceptance/bundle/resources/postgres_branches/basic/output.txt
index de26b7f0e7..ae9053d377 100644
--- a/acceptance/bundle/resources/postgres_branches/basic/output.txt
+++ b/acceptance/bundle/resources/postgres_branches/basic/output.txt
@@ -38,7 +38,7 @@ Deployment complete!
     "current_state": "READY",
     "default": false,
     "is_protected": false,
-    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
     "source_branch_lsn": "[LSN]",
     "source_branch_time": "[TIMESTAMP]",
     "state_change_time": "[TIMESTAMP]"
diff --git a/acceptance/bundle/resources/postgres_branches/recreate/out.get_branch.txt b/acceptance/bundle/resources/postgres_branches/recreate/out.get_branch.txt
index b67568fe15..46df988170 100644
--- a/acceptance/bundle/resources/postgres_branches/recreate/out.get_branch.txt
+++ b/acceptance/bundle/resources/postgres_branches/recreate/out.get_branch.txt
@@ -5,7 +5,7 @@
     "current_state": "READY",
     "default": false,
     "is_protected": false,
-    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
     "source_branch_lsn": "[LSN]",
     "source_branch_time": "[TIMESTAMP]",
     "state_change_time": "[TIMESTAMP]"
diff --git a/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.no_change.direct.json b/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.no_change.direct.json
index 99377fbc4c..32120ec36e 100644
--- a/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.no_change.direct.json
+++ b/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.no_change.direct.json
@@ -14,7 +14,7 @@
       "current_state": "READY",
       "default": false,
       "is_protected": false,
-      "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+      "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
       "source_branch_lsn": "[LSN]",
       "source_branch_time": "[TIMESTAMP]",
       "state_change_time": "[TIMESTAMP]"
diff --git a/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.restore.direct.json b/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.restore.direct.json
index 55de1ec12d..110fb1aea0 100644
--- a/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.restore.direct.json
+++ b/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.restore.direct.json
@@ -22,7 +22,7 @@
       "current_state": "READY",
       "default": false,
       "is_protected": true,
-      "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+      "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
       "source_branch_lsn": "[LSN]",
       "source_branch_time": "[TIMESTAMP]",
       "state_change_time": "[TIMESTAMP]"
diff --git a/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.update.direct.json b/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.update.direct.json
index c466b27a61..58169e75a3 100644
--- a/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.update.direct.json
+++ b/acceptance/bundle/resources/postgres_branches/update_protected/out.plan.update.direct.json
@@ -22,7 +22,7 @@
       "current_state": "READY",
       "default": false,
       "is_protected": false,
-      "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+      "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
       "source_branch_lsn": "[LSN]",
       "source_branch_time": "[TIMESTAMP]",
       "state_change_time": "[TIMESTAMP]"
diff --git a/acceptance/bundle/resources/postgres_branches/update_protected/output.txt b/acceptance/bundle/resources/postgres_branches/update_protected/output.txt
index 343f8257f4..b32d48a909 100644
--- a/acceptance/bundle/resources/postgres_branches/update_protected/output.txt
+++ b/acceptance/bundle/resources/postgres_branches/update_protected/output.txt
@@ -33,7 +33,7 @@ Deployment complete!
     "current_state": "READY",
     "default": false,
     "is_protected": false,
-    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
     "source_branch_lsn": "[LSN]",
     "source_branch_time": "[TIMESTAMP]",
     "state_change_time": "[TIMESTAMP]"
@@ -107,7 +107,7 @@ Deployment complete!
     "current_state": "READY",
     "default": false,
     "is_protected": true,
-    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
     "source_branch_lsn": "[LSN]",
     "source_branch_time": "[TIMESTAMP]",
     "state_change_time": "[TIMESTAMP]"
@@ -141,7 +141,7 @@ Deployment complete!
     "current_state": "READY",
     "default": false,
     "is_protected": false,
-    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/[BRANCH_UID]",
+    "source_branch": "projects/test-pg-proj-[UNIQUE_NAME]/branches/production",
     "source_branch_lsn": "[LSN]",
     "source_branch_time": "[TIMESTAMP]",
     "state_change_time": "[TIMESTAMP]"
diff --git a/libs/testserver/postgres.go b/libs/testserver/postgres.go
index 3ff865d4d9..5961b2f7e3 100644
--- a/libs/testserver/postgres.go
+++ b/libs/testserver/postgres.go
@@ -618,10 +618,11 @@ func (s *FakeWorkspace) createOperationLocked(resourceName string, response any)
 }
 
 // createDefaultBranchLocked creates a default branch for a project (caller must hold lock).
+// The default branch is named "production" to match cloud API behavior.
 func (s *FakeWorkspace) createDefaultBranchLocked(projectName string) {
 	now := nowTime()
 	branchUID := "br-" + nextUUID()[:20]
-	branchName := projectName + "/branches/" + branchUID
+	branchName := projectName + "/branches/production"
 
 	defaultBranch := postgres.Branch{
 		Name:       branchName,