diff --git a/a2a.yaml b/a2a.yaml
index a58e543..b58dc07 100644
--- a/a2a.yaml
+++ b/a2a.yaml
@@ -1,5 +1,5 @@
 name: contract-clock-studio-v1
-version: 0.1.7
+version: 0.1.8
 entrypoint: agent:ContractClockStudioV1
 expose:
   public: false
diff --git a/agent.py b/agent.py
index b1078e5..7894932 100644
--- a/agent.py
+++ b/agent.py
@@ -108,7 +108,7 @@ class ContractClockStudioV1(A2AAgent[ContractClockStudioV1Config, PlatformUserAu
         "from contracts, persists user-scoped timelines, and serves a packed "
         "one-page React product at /app."
     )
-    version = "0.1.7"
+    version = "0.1.8"
 
     config_model = ContractClockStudioV1Config
     auth_model = PlatformUserAuth
diff --git a/db/migrations/002_reconcile_execution_receipts.sql b/db/migrations/002_reconcile_execution_receipts.sql
index a697e34..775a914 100644
--- a/db/migrations/002_reconcile_execution_receipts.sql
+++ b/db/migrations/002_reconcile_execution_receipts.sql
@@ -19,6 +19,8 @@ BEGIN
     ) THEN
         EXECUTE 'UPDATE execution_receipts
                  SET tool_name = COALESCE(tool_name, skill_name)';
+        EXECUTE 'ALTER TABLE execution_receipts
+                 ALTER COLUMN skill_name DROP NOT NULL';
     END IF;
 END
 $$;
diff --git a/db/migrations/003_relax_legacy_receipt_skill.sql b/db/migrations/003_relax_legacy_receipt_skill.sql
new file mode 100644
index 0000000..45353c1
--- /dev/null
+++ b/db/migrations/003_relax_legacy_receipt_skill.sql
@@ -0,0 +1,18 @@
+-- Migration 002 may already have run on a legacy database before its
+-- skill_name constraint reconciliation was added. Relax that obsolete column
+-- in a separately versioned migration so current installations are repaired.
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1
+        FROM information_schema.columns
+        WHERE table_schema = current_schema()
+          AND table_name = 'execution_receipts'
+          AND column_name = 'skill_name'
+          AND is_nullable = 'NO'
+    ) THEN
+        EXECUTE 'ALTER TABLE execution_receipts
+                 ALTER COLUMN skill_name DROP NOT NULL';
+    END IF;
+END
+$$;
diff --git a/tests/test_full_stack_contract.py b/tests/test_full_stack_contract.py
index 847addd..de27db7 100644
--- a/tests/test_full_stack_contract.py
+++ b/tests/test_full_stack_contract.py
@@ -26,7 +26,7 @@ def test_full_stack_product_contract_card_and_manifest():
     frontend = (ROOT / "frontend" / "src" / "App.jsx").read_text(encoding="utf-8")
     a2a_client = (ROOT / "frontend" / "src" / "a2a.js").read_text(encoding="utf-8")
 
-    assert "version: 0.1.7" in manifest
+    assert "version: 0.1.8" in manifest
     assert "public: false" in manifest
     assert "frontend:" in manifest and "mount: /app" in manifest
     assert "resources:" in manifest and "databases:" in manifest
@@ -44,7 +44,7 @@ def test_full_stack_product_contract_card_and_manifest():
     assert migrations and all(path.read_text(encoding="utf-8").strip() for path in migrations)
 
     card = load_local_project(ROOT).agent_cls().card()
-    assert card.version == "0.1.7"
+    assert card.version == "0.1.8"
     skill_names = {skill.name for skill in card.skills}
     assert {"analyze_contract", "get_contract_deadlines", "analyze_contract_upload_base64", "analyze_contract_file"} <= skill_names
     analyze_schema = next(skill.input_schema for skill in card.skills if skill.name == "analyze_contract")
@@ -63,8 +63,15 @@ def test_full_stack_product_contract_card_and_manifest():
     )
     assert "ADD COLUMN IF NOT EXISTS tool_name" in reconciliation
     assert "COALESCE(tool_name, skill_name)" in reconciliation
+    assert "ALTER COLUMN skill_name DROP NOT NULL" in reconciliation
     assert "ALTER COLUMN input_hash SET NOT NULL" in reconciliation
 
+    legacy_constraint_fix = (
+        ROOT / "db" / "migrations" / "003_relax_legacy_receipt_skill.sql"
+    ).read_text(encoding="utf-8")
+    assert "column_name = 'skill_name'" in legacy_constraint_fix
+    assert "ALTER COLUMN skill_name DROP NOT NULL" in legacy_constraint_fix
+
 
 def test_explicit_date_only_success_and_failure():
     module = load_agent_module()