Fix task API stability and Playwright runtime in Docker

Dockerfile

@@ -25,6 +25,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 COPY backend/requirements.txt /app/backend/requirements.txt
 RUN pip install --no-cache-dir -r /app/backend/requirements.txt
+RUN python -m playwright install --with-deps chromium
 
 COPY backend/ /app/backend/
 COPY --from=frontend-build /app/frontend/build /app/frontend/build

backend/requirements.txt

@@ -54,3 +54,4 @@ email-validator
 openai
 playwright
 tenacity
+Pillow

backend/src/core/task_manager/manager.py

@@ -11,7 +11,7 @@ import asyncio
 import threading
 import inspect
 from concurrent.futures import ThreadPoolExecutor
-from datetime import datetime
+from datetime import datetime, timezone
 from typing import Dict, Any, List, Optional
 
 from .models import Task, TaskStatus, LogEntry, LogFilter, LogStats
@@ -329,8 +329,18 @@ class TaskManager:
             tasks = [t for t in tasks if t.plugin_id in plugin_id_set]
         if completed_only:
             tasks = [t for t in tasks if t.status in [TaskStatus.SUCCESS, TaskStatus.FAILED]]
-        # Sort by start_time descending (most recent first)
+        # Sort by started_at descending with tolerant handling of mixed tz-aware/naive values.
-        tasks.sort(key=lambda t: t.started_at or datetime.min, reverse=True)
+        def sort_key(task: Task) -> float:
+            started_at = task.started_at
+            if started_at is None:
+                return float("-inf")
+            if not isinstance(started_at, datetime):
+                return float("-inf")
+            if started_at.tzinfo is None:
+                return started_at.replace(tzinfo=timezone.utc).timestamp()
+            return started_at.timestamp()
+
+        tasks.sort(key=sort_key, reverse=True)
         return tasks[offset:offset + limit]
     # [/DEF:get_tasks:Function]
 

backend/src/core/task_manager/models.py

@@ -109,7 +109,8 @@ class Task(BaseModel):
     params: Dict[str, Any] = Field(default_factory=dict)
     input_required: bool = False
     input_request: Optional[Dict[str, Any]] = None
-    result: Optional[Dict[str, Any]] = None
+    # Result payload can be dict/list/scalar depending on plugin and legacy records.
+    result: Optional[Any] = None
 
     # [DEF:__init__:Function]
     # @PURPOSE: Initializes the Task model and validates input_request for AWAITING_INPUT status.

backend/src/core/task_manager/persistence.py

@@ -12,6 +12,7 @@ import json
 
 from sqlalchemy.orm import Session
 from ...models.task import TaskRecord, TaskLogRecord
+from ...models.mapping import Environment
 from ..database import TasksSessionLocal
 from .models import Task, TaskStatus, LogEntry, TaskLog, LogFilter, LogStats
 from ..logger import logger, belief_scope
@@ -21,6 +22,40 @@ from ..logger import logger, belief_scope
 # @SEMANTICS: persistence, service, database, sqlalchemy
 # @PURPOSE: Provides methods to save and load tasks from the tasks.db database using SQLAlchemy.
 class TaskPersistenceService:
+    @staticmethod
+    def _json_load_if_needed(value):
+        if value is None:
+            return None
+        if isinstance(value, (dict, list)):
+            return value
+        if isinstance(value, str):
+            stripped = value.strip()
+            if stripped == "" or stripped.lower() == "null":
+                return None
+            try:
+                return json.loads(stripped)
+            except json.JSONDecodeError:
+                return value
+        return value
+
+    @staticmethod
+    def _parse_datetime(value):
+        if value is None or isinstance(value, datetime):
+            return value
+        if isinstance(value, str):
+            try:
+                return datetime.fromisoformat(value)
+            except ValueError:
+                return None
+        return None
+
+    @staticmethod
+    def _resolve_environment_id(session: Session, env_id: Optional[str]) -> Optional[str]:
+        if not env_id:
+            return None
+        exists = session.query(Environment.id).filter(Environment.id == env_id).first()
+        return env_id if exists else None
+
     # [DEF:__init__:Function]
     # @PURPOSE: Initializes the persistence service.
     # @PRE:     None.
@@ -48,7 +83,8 @@ class TaskPersistenceService:
                 
                 record.type = task.plugin_id
                 record.status = task.status.value
-                record.environment_id = task.params.get("environment_id") or task.params.get("source_env_id")
+                raw_env_id = task.params.get("environment_id") or task.params.get("source_env_id")
+                record.environment_id = self._resolve_environment_id(session, raw_env_id)
                 record.started_at = task.started_at
                 record.finished_at = task.finished_at
                 
@@ -123,21 +159,28 @@ class TaskPersistenceService:
                 for record in records:
                     try:
                         logs = []
-                        if record.logs:
+                        logs_payload = self._json_load_if_needed(record.logs)
-                            for log_data in record.logs:
+                        if isinstance(logs_payload, list):
-                                # Handle timestamp conversion if it's a string
+                            for log_data in logs_payload:
-                                if isinstance(log_data.get('timestamp'), str):
+                                if not isinstance(log_data, dict):
-                                    log_data['timestamp'] = datetime.fromisoformat(log_data['timestamp'])
+                                    continue
+                                log_data = dict(log_data)
+                                log_data['timestamp'] = self._parse_datetime(log_data.get('timestamp')) or datetime.utcnow()
                                 logs.append(LogEntry(**log_data))
 
+                        started_at = self._parse_datetime(record.started_at)
+                        finished_at = self._parse_datetime(record.finished_at)
+                        params = self._json_load_if_needed(record.params)
+                        result = self._json_load_if_needed(record.result)
+
                         task = Task(
                             id=record.id,
                             plugin_id=record.type,
                             status=TaskStatus(record.status),
-                            started_at=record.started_at,
+                            started_at=started_at,
-                            finished_at=record.finished_at,
+                            finished_at=finished_at,
-                            params=record.params or {},
+                            params=params if isinstance(params, dict) else {},
-                            result=record.result,
+                            result=result,
                             logs=logs
                         )
                         loaded_tasks.append(task)

backend/src/plugins/llm_analysis/plugin.py

@@ -74,7 +74,8 @@ class DashboardValidationPlugin(PluginBase):
             
             log.info(f"Executing {self.name} with params: {params}")
             
-            dashboard_id = params.get("dashboard_id")
+            dashboard_id_raw = params.get("dashboard_id")
+            dashboard_id = str(dashboard_id_raw) if dashboard_id_raw is not None else None
             env_id = params.get("environment_id")
             provider_id = params.get("provider_id")