diff --git a/admin/admin_test.go b/admin/admin_test.go
new file mode 100644
index 00000000..4fac365e
--- /dev/null
+++ b/admin/admin_test.go
@@ -0,0 +1,57 @@
+package admin
+
+import (
+	"testing"
+)
+
+func TestLoadConfig_Parses(t *testing.T) {
+	cfg, err := LoadConfig()
+	if err != nil {
+		t.Fatalf("LoadConfig: %v", err)
+	}
+	if cfg == nil {
+		t.Fatal("expected non-nil config")
+	}
+	if len(cfg.Modules) == 0 {
+		t.Error("expected at least one module in admin config")
+	}
+}
+
+func TestLoadConfigRaw_NonEmpty(t *testing.T) {
+	raw, err := LoadConfigRaw()
+	if err != nil {
+		t.Fatalf("LoadConfigRaw: %v", err)
+	}
+	if len(raw) == 0 {
+		t.Error("expected non-empty raw config data")
+	}
+}
+
+func TestLoadConfig_HasExpectedModules(t *testing.T) {
+	cfg, err := LoadConfig()
+	if err != nil {
+		t.Fatalf("LoadConfig: %v", err)
+	}
+
+	moduleNames := make(map[string]bool)
+	for _, m := range cfg.Modules {
+		moduleNames[m.Name] = true
+	}
+
+	required := []string{"admin-server", "admin-router", "admin-db", "admin-auth"}
+	for _, name := range required {
+		if !moduleNames[name] {
+			t.Errorf("expected module %q in admin config", name)
+		}
+	}
+}
+
+func TestLoadConfig_HasWorkflows(t *testing.T) {
+	cfg, err := LoadConfig()
+	if err != nil {
+		t.Fatalf("LoadConfig: %v", err)
+	}
+	if len(cfg.Workflows) == 0 {
+		t.Error("expected at least one workflow in admin config")
+	}
+}
diff --git a/module/api_v1_test.go b/module/api_v1_test.go
index edb97357..7bf27f8e 100644
--- a/module/api_v1_test.go
+++ b/module/api_v1_test.go
@@ -718,3 +718,335 @@ func TestV1Handler_Projects(t *testing.T) {
 		t.Errorf("got %d projects, want 1", len(projects))
 	}
 }
+
+// --- Phase C: Execution, Step, Log, and Audit table tests ---
+
+func TestV1Store_ExecutionLifecycle(t *testing.T) {
+	store := setupTestStore(t)
+
+	company, err := store.CreateCompany("Co", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateCompany: %v", err)
+	}
+	org, err := store.CreateOrganization(company.ID, "Org", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateOrganization: %v", err)
+	}
+	proj, err := store.CreateProject(org.ID, "Proj", "", "")
+	if err != nil {
+		t.Fatalf("CreateProject: %v", err)
+	}
+	wf, err := store.CreateWorkflow(proj.ID, "WF", "", "", "modules: []", "u1")
+	if err != nil {
+		t.Fatalf("CreateWorkflow: %v", err)
+	}
+
+	now := time.Now().UTC()
+	execID := "exec-001"
+
+	// Insert execution
+	err = store.InsertExecution(execID, wf.ID, "manual", "pending", "u1", now)
+	if err != nil {
+		t.Fatalf("InsertExecution: %v", err)
+	}
+
+	// Verify via direct query
+	var status string
+	err = store.DB().QueryRow("SELECT status FROM workflow_executions WHERE id = ?", execID).Scan(&status)
+	if err != nil {
+		t.Fatalf("query execution: %v", err)
+	}
+	if status != "pending" {
+		t.Errorf("got status %q, want %q", status, "pending")
+	}
+
+	// Complete execution
+	completedAt := now.Add(5 * time.Second)
+	err = store.CompleteExecution(execID, "completed", completedAt, 5000, "")
+	if err != nil {
+		t.Fatalf("CompleteExecution: %v", err)
+	}
+
+	err = store.DB().QueryRow("SELECT status FROM workflow_executions WHERE id = ?", execID).Scan(&status)
+	if err != nil {
+		t.Fatalf("query completed execution: %v", err)
+	}
+	if status != "completed" {
+		t.Errorf("got status %q, want %q", status, "completed")
+	}
+
+	// Count executions
+	counts, err := store.CountExecutionsByWorkflow(wf.ID)
+	if err != nil {
+		t.Fatalf("CountExecutionsByWorkflow: %v", err)
+	}
+	if counts["completed"] != 1 {
+		t.Errorf("got completed count %d, want 1", counts["completed"])
+	}
+}
+
+func TestV1Store_ExecutionStepLifecycle(t *testing.T) {
+	store := setupTestStore(t)
+
+	company, err := store.CreateCompany("Co", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateCompany: %v", err)
+	}
+	org, err := store.CreateOrganization(company.ID, "Org", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateOrganization: %v", err)
+	}
+	proj, err := store.CreateProject(org.ID, "Proj", "", "")
+	if err != nil {
+		t.Fatalf("CreateProject: %v", err)
+	}
+	wf, err := store.CreateWorkflow(proj.ID, "WF", "", "", "modules: []", "u1")
+	if err != nil {
+		t.Fatalf("CreateWorkflow: %v", err)
+	}
+
+	now := time.Now().UTC()
+	execID := "exec-step-001"
+	if err = store.InsertExecution(execID, wf.ID, "manual", "running", "u1", now); err != nil {
+		t.Fatalf("InsertExecution: %v", err)
+	}
+
+	stepID := "step-001"
+	err = store.InsertExecutionStep(stepID, execID, "parse-request", "step.request_parse", "running", 0, now)
+	if err != nil {
+		t.Fatalf("InsertExecutionStep: %v", err)
+	}
+
+	// Verify step exists
+	var stepName string
+	err = store.DB().QueryRow("SELECT step_name FROM execution_steps WHERE id = ?", stepID).Scan(&stepName)
+	if err != nil {
+		t.Fatalf("query step: %v", err)
+	}
+	if stepName != "parse-request" {
+		t.Errorf("got step_name %q, want %q", stepName, "parse-request")
+	}
+
+	// Complete step
+	err = store.CompleteExecutionStep(stepID, "completed", now.Add(time.Second), 1000, "")
+	if err != nil {
+		t.Fatalf("CompleteExecutionStep: %v", err)
+	}
+
+	var stepStatus string
+	err = store.DB().QueryRow("SELECT status FROM execution_steps WHERE id = ?", stepID).Scan(&stepStatus)
+	if err != nil {
+		t.Fatalf("query completed step: %v", err)
+	}
+	if stepStatus != "completed" {
+		t.Errorf("got status %q, want %q", stepStatus, "completed")
+	}
+
+	// Insert a second step with higher sequence
+	step2ID := "step-002"
+	err = store.InsertExecutionStep(step2ID, execID, "db-query", "step.db_query", "running", 1, now)
+	if err != nil {
+		t.Fatalf("InsertExecutionStep(2): %v", err)
+	}
+
+	// Verify ordering
+	rows, err := store.DB().Query("SELECT id FROM execution_steps WHERE execution_id = ? ORDER BY sequence_num ASC", execID)
+	if err != nil {
+		t.Fatalf("query steps: %v", err)
+	}
+	defer rows.Close()
+	var ids []string
+	for rows.Next() {
+		var id string
+		if err := rows.Scan(&id); err != nil {
+			t.Fatalf("scan step id: %v", err)
+		}
+		ids = append(ids, id)
+	}
+	if err := rows.Err(); err != nil {
+		t.Fatalf("iterate steps: %v", err)
+	}
+	if len(ids) != 2 || ids[0] != stepID || ids[1] != step2ID {
+		t.Errorf("got step order %v, want [%s, %s]", ids, stepID, step2ID)
+	}
+}
+
+func TestV1Store_ExecutionLogs(t *testing.T) {
+	store := setupTestStore(t)
+
+	company, err := store.CreateCompany("Co", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateCompany: %v", err)
+	}
+	org, err := store.CreateOrganization(company.ID, "Org", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateOrganization: %v", err)
+	}
+	proj, err := store.CreateProject(org.ID, "Proj", "", "")
+	if err != nil {
+		t.Fatalf("CreateProject: %v", err)
+	}
+	wf, err := store.CreateWorkflow(proj.ID, "WF", "", "", "modules: []", "u1")
+	if err != nil {
+		t.Fatalf("CreateWorkflow: %v", err)
+	}
+
+	now := time.Now().UTC()
+
+	// Insert logs at various levels
+	err = store.InsertLog(wf.ID, "exec-1", "info", "Workflow started", "engine", "{}", now)
+	if err != nil {
+		t.Fatalf("InsertLog(info): %v", err)
+	}
+	err = store.InsertLog(wf.ID, "exec-1", "error", "Step failed", "handler", `{"step":"validate"}`, now.Add(time.Second))
+	if err != nil {
+		t.Fatalf("InsertLog(error): %v", err)
+	}
+	err = store.InsertLog(wf.ID, "exec-1", "event", "user.created", "eventbus", "{}", now.Add(2*time.Second))
+	if err != nil {
+		t.Fatalf("InsertLog(event): %v", err)
+	}
+
+	// Count logs by level
+	counts, err := store.CountLogsByWorkflow(wf.ID)
+	if err != nil {
+		t.Fatalf("CountLogsByWorkflow: %v", err)
+	}
+	if counts["info"] != 1 {
+		t.Errorf("got info count %d, want 1", counts["info"])
+	}
+	if counts["error"] != 1 {
+		t.Errorf("got error count %d, want 1", counts["error"])
+	}
+	if counts["event"] != 1 {
+		t.Errorf("got event count %d, want 1", counts["event"])
+	}
+
+	// Verify log content
+	var msg string
+	err = store.DB().QueryRow("SELECT message FROM execution_logs WHERE level = 'error' AND workflow_id = ?", wf.ID).Scan(&msg)
+	if err != nil {
+		t.Fatalf("query error log: %v", err)
+	}
+	if msg != "Step failed" {
+		t.Errorf("got message %q, want %q", msg, "Step failed")
+	}
+}
+
+func TestV1Store_AuditLog(t *testing.T) {
+	store := setupTestStore(t)
+
+	now := time.Now().UTC().Format(time.RFC3339)
+
+	// Insert audit entries directly (no convenience method exists)
+	_, err := store.DB().Exec(
+		"INSERT INTO audit_log (user_id, action, resource_type, resource_id, details, ip_address, user_agent, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
+		"user-1", "create", "workflow", "wf-123", `{"name":"test"}`, "127.0.0.1", "test-agent", now,
+	)
+	if err != nil {
+		t.Fatalf("insert audit_log: %v", err)
+	}
+
+	_, err = store.DB().Exec(
+		"INSERT INTO audit_log (user_id, action, resource_type, resource_id, details, ip_address, user_agent, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
+		"user-1", "deploy", "workflow", "wf-123", "{}", "127.0.0.1", "test-agent", now,
+	)
+	if err != nil {
+		t.Fatalf("insert audit_log(2): %v", err)
+	}
+
+	// Query audit log
+	var count int
+	err = store.DB().QueryRow("SELECT COUNT(*) FROM audit_log WHERE resource_id = ?", "wf-123").Scan(&count)
+	if err != nil {
+		t.Fatalf("count audit_log: %v", err)
+	}
+	if count != 2 {
+		t.Errorf("got %d audit entries, want 2", count)
+	}
+
+	// Verify ordering (newest first)
+	var action string
+	err = store.DB().QueryRow("SELECT action FROM audit_log ORDER BY id DESC LIMIT 1").Scan(&action)
+	if err != nil {
+		t.Fatalf("query latest audit: %v", err)
+	}
+	if action != "deploy" {
+		t.Errorf("got latest action %q, want %q", action, "deploy")
+	}
+}
+
+func TestV1Store_PhaseCTablesExist(t *testing.T) {
+	store := setupTestStore(t)
+	db := store.DB()
+
+	tables := []string{
+		"workflow_executions",
+		"execution_steps",
+		"execution_logs",
+		"audit_log",
+		"iam_provider_configs",
+		"iam_role_mappings",
+	}
+
+	for _, table := range tables {
+		var name string
+		err := db.QueryRow("SELECT name FROM sqlite_master WHERE type='table' AND name=?", table).Scan(&name)
+		if err != nil {
+			t.Errorf("table %q not found: %v", table, err)
+		}
+	}
+}
+
+func TestV1Store_ExecutionFailure(t *testing.T) {
+	store := setupTestStore(t)
+
+	company, err := store.CreateCompany("Co", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateCompany: %v", err)
+	}
+	org, err := store.CreateOrganization(company.ID, "Org", "", "u1")
+	if err != nil {
+		t.Fatalf("CreateOrganization: %v", err)
+	}
+	proj, err := store.CreateProject(org.ID, "Proj", "", "")
+	if err != nil {
+		t.Fatalf("CreateProject: %v", err)
+	}
+	wf, err := store.CreateWorkflow(proj.ID, "WF", "", "", "modules: []", "u1")
+	if err != nil {
+		t.Fatalf("CreateWorkflow: %v", err)
+	}
+
+	now := time.Now().UTC()
+	execID := "exec-fail-001"
+	if err = store.InsertExecution(execID, wf.ID, "manual", "running", "u1", now); err != nil {
+		t.Fatalf("InsertExecution: %v", err)
+	}
+
+	// Fail the execution with an error message
+	err = store.CompleteExecution(execID, "failed", now.Add(3*time.Second), 3000, "timeout exceeded")
+	if err != nil {
+		t.Fatalf("CompleteExecution(failed): %v", err)
+	}
+
+	var status, errMsg string
+	err = store.DB().QueryRow("SELECT status, error_message FROM workflow_executions WHERE id = ?", execID).Scan(&status, &errMsg)
+	if err != nil {
+		t.Fatalf("query failed execution: %v", err)
+	}
+	if status != "failed" {
+		t.Errorf("got status %q, want %q", status, "failed")
+	}
+	if errMsg != "timeout exceeded" {
+		t.Errorf("got error_message %q, want %q", errMsg, "timeout exceeded")
+	}
+
+	counts, err := store.CountExecutionsByWorkflow(wf.ID)
+	if err != nil {
+		t.Fatalf("CountExecutionsByWorkflow: %v", err)
+	}
+	if counts["failed"] != 1 {
+		t.Errorf("got failed count %d, want 1", counts["failed"])
+	}
+}
diff --git a/module/command_handler_test.go b/module/command_handler_test.go
index 7819aad4..14605036 100644
--- a/module/command_handler_test.go
+++ b/module/command_handler_test.go
@@ -294,4 +294,3 @@ func TestCommandHandler_RoutePipeline_TypedNil(t *testing.T) {
 		t.Errorf("expected 404 for typed-nil pipeline, got %d", rr.Code)
 	}
 }
-
diff --git a/module/query_handler_test.go b/module/query_handler_test.go
index a8243538..132ebab5 100644
--- a/module/query_handler_test.go
+++ b/module/query_handler_test.go
@@ -299,4 +299,3 @@ func TestQueryHandler_RoutePipeline_TypedNil(t *testing.T) {
 		t.Errorf("expected 404 for typed-nil pipeline, got %d", rr.Code)
 	}
 }
-
diff --git a/plugins/api/plugin.go b/plugins/api/plugin.go
index c3e1fa49..9ef86b44 100644
--- a/plugins/api/plugin.go
+++ b/plugins/api/plugin.go
@@ -100,12 +100,14 @@ func New() *Plugin {
 	return &Plugin{
 		// Default constructors wrap the concrete module constructors, adapting
 		// their return types to modular.Module via implicit interface satisfaction.
-		newQueryHandler:     func(name string) modular.Module { return module.NewQueryHandler(name) },
-		newCommandHandler:   func(name string) modular.Module { return module.NewCommandHandler(name) },
-		newRESTAPIHandler:   func(name, resourceName string) modular.Module { return module.NewRESTAPIHandler(name, resourceName) },
-		newAPIGateway:       func(name string) modular.Module { return module.NewAPIGateway(name) },
-		newWorkflowRegistry: func(name, storageBackend string) modular.Module { return module.NewWorkflowRegistry(name, storageBackend) },
-		newDataTransformer:  func(name string) modular.Module { return module.NewDataTransformer(name) },
+		newQueryHandler:   func(name string) modular.Module { return module.NewQueryHandler(name) },
+		newCommandHandler: func(name string) modular.Module { return module.NewCommandHandler(name) },
+		newRESTAPIHandler: func(name, resourceName string) modular.Module { return module.NewRESTAPIHandler(name, resourceName) },
+		newAPIGateway:     func(name string) modular.Module { return module.NewAPIGateway(name) },
+		newWorkflowRegistry: func(name, storageBackend string) modular.Module {
+			return module.NewWorkflowRegistry(name, storageBackend)
+		},
+		newDataTransformer: func(name string) modular.Module { return module.NewDataTransformer(name) },
 		newProcessingStep: func(name string, cfg module.ProcessingStepConfig) modular.Module {
 			return module.NewProcessingStep(name, cfg)
 		},