test(saas): Phase 1 integration tests — billing + scheduled_task + knowledge (68 tests)

- Fix TIMESTAMPTZ decode errors: add ::TEXT cast to all SELECT queries
  where Row structs use String for TIMESTAMPTZ columns (~22 locations)
- Fix Axum 0.7 route params: {id} → :id in billing/knowledge/scheduled_task routes
- Fix JSONB bind: scheduled_task INSERT uses ::jsonb cast for input_payload
- Add billing_test.rs (14 tests): plans, subscription, usage, payments, invoices
- Add scheduled_task_test.rs (12 tests): CRUD, validation, isolation
- Add knowledge_test.rs (20 tests): categories, items, versions, search, analytics, permissions
- Fix auth test regression: 6 tests were failing due to TIMESTAMPTZ type mismatch

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

crates/zclaw-saas/src/migration/service.rs

@@ -15,19 +15,19 @@ pub(crate) async fn fetch_all_config_items(
 ) -> SaasResult<Vec<ConfigItemInfo>> {
     let sql = match (&query.category, &query.source) {
         (Some(_), Some(_)) => {
-            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
              FROM config_items WHERE category = $1 AND source = $2 ORDER BY category, key_path"
         }
         (Some(_), None) => {
-            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
              FROM config_items WHERE category = $1 ORDER BY key_path"
         }
         (None, Some(_)) => {
-            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
              FROM config_items WHERE source = $1 ORDER BY category, key_path"
         }
         (None, None) => {
-            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
              FROM config_items ORDER BY category, key_path"
         }
     };
@@ -61,7 +61,7 @@ pub async fn list_config_items(
                 "SELECT COUNT(*) FROM config_items WHERE category = $1 AND source = $2"
             ).bind(cat).bind(src).fetch_one(db).await?;
             let rows = sqlx::query_as::<_, ConfigItemRow>(
-                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
                  FROM config_items WHERE category = $1 AND source = $2 ORDER BY category, key_path LIMIT $3 OFFSET $4"
             ).bind(cat).bind(src).bind(ps as i64).bind(offset).fetch_all(db).await?;
             (total, rows)
@@ -71,7 +71,7 @@ pub async fn list_config_items(
                 "SELECT COUNT(*) FROM config_items WHERE category = $1"
             ).bind(cat).fetch_one(db).await?;
             let rows = sqlx::query_as::<_, ConfigItemRow>(
-                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
                  FROM config_items WHERE category = $1 ORDER BY category, key_path LIMIT $2 OFFSET $3"
             ).bind(cat).bind(ps as i64).bind(offset).fetch_all(db).await?;
             (total, rows)
@@ -81,7 +81,7 @@ pub async fn list_config_items(
                 "SELECT COUNT(*) FROM config_items WHERE source = $1"
             ).bind(src).fetch_one(db).await?;
             let rows = sqlx::query_as::<_, ConfigItemRow>(
-                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
                  FROM config_items WHERE source = $1 ORDER BY category, key_path LIMIT $2 OFFSET $3"
             ).bind(src).bind(ps as i64).bind(offset).fetch_all(db).await?;
             (total, rows)
@@ -91,7 +91,7 @@ pub async fn list_config_items(
                 "SELECT COUNT(*) FROM config_items"
             ).fetch_one(db).await?;
             let rows = sqlx::query_as::<_, ConfigItemRow>(
-                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+                "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
                  FROM config_items ORDER BY category, key_path LIMIT $1 OFFSET $2"
             ).bind(ps as i64).bind(offset).fetch_all(db).await?;
             (total, rows)
@@ -108,7 +108,7 @@ pub async fn list_config_items(
 pub async fn get_config_item(db: &PgPool, item_id: &str) -> SaasResult<ConfigItemInfo> {
     let row: Option<ConfigItemRow> =
         sqlx::query_as(
-            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at, updated_at
+            "SELECT id, category, key_path, value_type, current_value, default_value, source, description, requires_restart, created_at::TEXT, updated_at::TEXT
              FROM config_items WHERE id = $1"
         )
         .bind(item_id)
@@ -124,7 +124,7 @@ pub async fn create_config_item(
     db: &PgPool, req: &CreateConfigItemRequest,
 ) -> SaasResult<ConfigItemInfo> {
     let id = uuid::Uuid::new_v4().to_string();
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
     let source = req.source.as_deref().unwrap_or("local");
     let requires_restart = req.requires_restart.unwrap_or(false);
 
@@ -156,7 +156,7 @@ pub async fn create_config_item(
 pub async fn update_config_item(
     db: &PgPool, item_id: &str, req: &UpdateConfigItemRequest,
 ) -> SaasResult<ConfigItemInfo> {
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
 
     // COALESCE pattern: all updatable fields in a single static SQL.
     // NULL parameters leave the column unchanged.
@@ -244,7 +244,7 @@ pub async fn seed_default_config_items(db: &PgPool) -> SaasResult<usize> {
     ];
 
     let mut created = 0;
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
 
     for (category, key_path, value_type, default_value, current_value, description) in defaults {
         let existing: Option<(String,)> = sqlx::query_as(
@@ -319,7 +319,7 @@ pub async fn compute_config_diff(
 pub async fn sync_config(
     db: &PgPool, account_id: &str, req: &SyncConfigRequest,
 ) -> SaasResult<ConfigSyncResult> {
-    let now = chrono::Utc::now().to_rfc3339();
+    let now = chrono::Utc::now();
     let config_keys_str = serde_json::to_string(&req.config_keys)?;
     let client_values_str = Some(serde_json::to_string(&req.client_values)?);
 
@@ -458,7 +458,7 @@ pub async fn list_sync_logs(
 
     let rows: Vec<ConfigSyncLogRow> =
         sqlx::query_as(
-            "SELECT id, account_id, client_fingerprint, action, config_keys, client_values, saas_values, resolution, created_at
+            "SELECT id, account_id, client_fingerprint, action, config_keys, client_values, saas_values, resolution, created_at::TEXT
              FROM config_sync_log WHERE account_id = $1 ORDER BY created_at DESC LIMIT $2 OFFSET $3"
         )
         .bind(account_id)