diff --git a/src/lai_automation/agent.py b/src/lai_automation/agent.py
index be04409..38fa79c 100644
--- a/src/lai_automation/agent.py
+++ b/src/lai_automation/agent.py
@@ -86,5 +86,5 @@ class AiderAgent:
             "--edit-format",
             "diff",
             "--timeout",
-            "60",
+            "180",
         ]
diff --git a/src/lai_automation/prompt.py b/src/lai_automation/prompt.py
index 4039cac..e117561 100644
--- a/src/lai_automation/prompt.py
+++ b/src/lai_automation/prompt.py
@@ -33,6 +33,15 @@ def build_task(report: FailureReport) -> str:
     response = redact(report.response)
     error = redact(report.error_message)
     sql = redact(report.sql_query)
+    tenant_scope = ''
+    if report.context.get('database_type') == 'customer':
+        tenant_scope = """
+Tenant routing fact:
+The customer has already selected one tenant database. SQL inside that database must not
+invent an additional customer discriminator column. Use only columns present in tracked
+schema/semantics, and fix SQL-generation guidance rather than rewriting one unknown column
+to another guessed column.
+"""
 
     return f"""You are fixing failure report #{report.id} in the Laravel AI Chat repository.
 
@@ -68,6 +77,7 @@ Observed error:
 
 Generated SQL, if relevant:
 {sql or '[not available]'}
+{tenant_scope}
 
 Run focused tests while working. Leave the repository with the fix and regression test applied.
 """
diff --git a/src/lai_automation/worker.py b/src/lai_automation/worker.py
index 3d2a2cd..b325436 100644
--- a/src/lai_automation/worker.py
+++ b/src/lai_automation/worker.py
@@ -50,6 +50,18 @@ class AutomationWorker:
                 metadata["changes"] = asdict(summary)
                 policy = evaluate_changes(summary, self.settings, workspace.path)
                 if not policy.allowed:
+                    if not summary.files and attempt < self.settings.max_agent_attempts:
+                        LOG.warning(
+                            "Agent produced no changes for report %s on attempt %s; requesting correction",
+                            report.id,
+                            attempt,
+                        )
+                        task = build_retry_task(
+                            RuntimeError(
+                                "No file changes were applied. Make the smallest concrete code and regression-test edits now."
+                            )
+                        )
+                        continue
                     raise RuntimeError(
                         "Policy rejected changes: " + "; ".join(policy.errors)
                     )
diff --git a/tests/test_agent.py b/tests/test_agent.py
index 9b54212..8802b16 100644
--- a/tests/test_agent.py
+++ b/tests/test_agent.py
@@ -12,7 +12,7 @@ def test_aider_command_cannot_mutate_git_configuration_or_send_analytics() -> No
     assert "--no-analytics" in command
     assert "--no-auto-commits" in command
     assert command.count("/dev/null") == 2
-    assert command[-4:] == ["--edit-format", "diff", "--timeout", "60"]
+    assert command[-4:] == ["--edit-format", "diff", "--timeout", "180"]
 
 
 def test_aider_environment_does_not_include_database_credentials(tmp_path, monkeypatch) -> None:
diff --git a/tests/test_prompt.py b/tests/test_prompt.py
index f8bc3af..40f6afd 100644
--- a/tests/test_prompt.py
+++ b/tests/test_prompt.py
@@ -59,3 +59,26 @@ def test_retry_task_contains_failure_without_secrets() -> None:
     assert "Missing import" in task
     assert "secret-value" not in task
     assert "Do not remove or weaken tests" in task
+
+
+def test_customer_database_task_explains_tenant_scope() -> None:
+    report = FailureReport(
+        id=13,
+        chat_message_id=1,
+        source="automatic",
+        category="sql_execution",
+        user_feedback=None,
+        feedback_type=None,
+        expected_behavior=None,
+        prompt="What did this customer buy most?",
+        response=None,
+        sql_query="SELECT * FROM invoice_row WHERE InvoiceCreator = 'tenant'",
+        error_message="Unknown column InvoiceCreator",
+        context={"database_type": "customer"},
+    )
+
+    task = build_task(report)
+
+    assert "already selected one tenant database" in task
+    assert "must not" in task
+    assert "guessed column" in task
diff --git a/tests/test_worker.py b/tests/test_worker.py
index 066bb2b..3406285 100644
--- a/tests/test_worker.py
+++ b/tests/test_worker.py
@@ -97,3 +97,45 @@ def test_failed_validation_gets_one_correction_before_pr() -> None:
     assert worker._run_tests.call_count == 2
     workspace.push_branch.assert_called_once()
     worker.reports.complete.assert_called_once()
+
+
+def test_no_change_response_gets_one_correction() -> None:
+    report = FailureReport(
+        id=14,
+        chat_message_id=1,
+        source="automatic",
+        category="sql_execution",
+        user_feedback=None,
+        feedback_type=None,
+        expected_behavior=None,
+        prompt="List products",
+        response=None,
+        sql_query=None,
+        error_message="Unknown column",
+        context={},
+    )
+    config = settings(mode="pr", dry_run=False, gitea_token="token")
+    worker = AutomationWorker(config)
+    worker.reports = Mock()
+    worker.reports.claim_next.return_value = report
+    worker.agent = Mock()
+    worker.agent.run.side_effect = ["no edit", "applied edit"]
+    worker.gitea = Mock()
+    worker._run_tests = Mock(return_value=[])
+    workspace = Mock()
+    workspace.path = Path("/tmp/nonexistent-workspace")
+    workspace.branch = "ai/failure-14"
+    workspace.summary.side_effect = [
+        ChangeSummary((), 0, 0),
+        ChangeSummary(("tests/Feature/FixTest.php",), 5, 0),
+        ChangeSummary(("tests/Feature/FixTest.php",), 5, 0),
+    ]
+    workspace.commit.return_value = "commit-id"
+
+    with patch("lai_automation.worker.GitWorkspace", return_value=workspace):
+        assert worker.run_once()
+
+    assert worker.agent.run.call_count == 2
+    assert "No file changes" in worker.agent.run.call_args_list[1].args[1]
+    worker._run_tests.assert_called_once()
+    workspace.push_branch.assert_called_once()