Refactor code structure for improved readability and maintainability

app/models/scheduled_task.py

@@ -1,6 +1,6 @@
 """Scheduled task model for flexible task scheduling with timezone support."""
 
-from datetime import datetime
+from datetime import UTC, datetime
 from enum import Enum
 from typing import Any
 
@@ -42,7 +42,7 @@ class RecurrenceType(str, Enum):
 class ScheduledTask(BaseModel, table=True):
     """Model for scheduled tasks with timezone support."""
 
-    __tablename__ = "scheduled_tasks"
+    __tablename__ = "scheduled_task"
 
     id: int | None = Field(primary_key=True, default=None)
     name: str = Field(max_length=255, description="Human-readable task name")
@@ -53,12 +53,12 @@ class ScheduledTask(BaseModel, table=True):
     scheduled_at: datetime = Field(description="When the task should be executed (UTC)")
     timezone: str = Field(
         default="UTC",
-        description="Timezone for scheduling (e.g., 'America/New_York', 'Europe/Paris')",
+        description="Timezone for scheduling (e.g., 'America/New_York')",
     )
     recurrence_type: RecurrenceType = Field(default=RecurrenceType.NONE)
     cron_expression: str | None = Field(
         default=None,
-        description="Cron expression for custom recurrence (when recurrence_type is CRON)",
+        description="Cron expression for custom recurrence",
     )
     recurrence_count: int | None = Field(
         default=None,
@@ -105,7 +105,7 @@ class ScheduledTask(BaseModel, table=True):
         """Check if the task has expired."""
         if self.expires_at is None:
             return False
-        return datetime.utcnow() > self.expires_at
+        return datetime.now(tz=UTC).replace(tzinfo=None) > self.expires_at
 
     def is_recurring(self) -> bool:
         """Check if the task is recurring."""