Add scheduled automation task and update URL routing

- Introduced a new scheduled task for executing automation rules every 5 minutes in the Celery beat schedule.
- Updated URL routing to include a new endpoint for automation-related functionalities.
- Refactored imports in various modules to align with the new business layer structure, ensuring backward compatibility for billing models, exceptions, and services.

backend/igny8_core/business/automation/models.py

@@ -0,0 +1,141 @@
+"""
+Automation Models
+Phase 2: Automation System
+"""
+from django.db import models
+from django.core.validators import MinValueValidator
+from igny8_core.auth.models import SiteSectorBaseModel, AccountBaseModel
+import json
+
+
+class AutomationRule(SiteSectorBaseModel):
+    """
+    Automation Rule model for defining automated workflows.
+    
+    Rules can be triggered by:
+    - schedule: Time-based triggers (cron-like)
+    - event: Event-based triggers (content created, keyword added, etc.)
+    - manual: Manual execution only
+    """
+    
+    TRIGGER_CHOICES = [
+        ('schedule', 'Schedule'),
+        ('event', 'Event'),
+        ('manual', 'Manual'),
+    ]
+    
+    STATUS_CHOICES = [
+        ('active', 'Active'),
+        ('inactive', 'Inactive'),
+        ('paused', 'Paused'),
+    ]
+    
+    name = models.CharField(max_length=255, help_text="Rule name")
+    description = models.TextField(blank=True, null=True, help_text="Rule description")
+    
+    # Trigger configuration
+    trigger = models.CharField(max_length=50, choices=TRIGGER_CHOICES, default='manual')
+    
+    # Schedule configuration (for schedule triggers)
+    # Stored as cron-like string: "0 0 * * *" (daily at midnight)
+    schedule = models.CharField(
+        max_length=100,
+        blank=True,
+        null=True,
+        help_text="Cron-like schedule string (e.g., '0 0 * * *' for daily at midnight)"
+    )
+    
+    # Conditions (JSON field)
+    # Format: [{"field": "content.status", "operator": "equals", "value": "draft"}, ...]
+    conditions = models.JSONField(
+        default=list,
+        help_text="List of conditions that must be met for rule to execute"
+    )
+    
+    # Actions (JSON field)
+    # Format: [{"type": "generate_content", "params": {...}}, ...]
+    actions = models.JSONField(
+        default=list,
+        help_text="List of actions to execute when rule triggers"
+    )
+    
+    # Status
+    is_active = models.BooleanField(default=True, help_text="Whether rule is active")
+    status = models.CharField(max_length=50, choices=STATUS_CHOICES, default='active')
+    
+    # Execution tracking
+    last_executed_at = models.DateTimeField(null=True, blank=True)
+    execution_count = models.IntegerField(default=0, validators=[MinValueValidator(0)])
+    
+    # Metadata
+    metadata = models.JSONField(default=dict, help_text="Additional metadata")
+    
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+    
+    class Meta:
+        db_table = 'igny8_automation_rules'
+        ordering = ['-created_at']
+        verbose_name = 'Automation Rule'
+        verbose_name_plural = 'Automation Rules'
+        indexes = [
+            models.Index(fields=['trigger', 'is_active']),
+            models.Index(fields=['status']),
+            models.Index(fields=['site', 'sector']),
+            models.Index(fields=['trigger', 'is_active', 'status']),
+        ]
+    
+    def __str__(self):
+        return f"{self.name} ({self.get_trigger_display()})"
+
+
+class ScheduledTask(AccountBaseModel):
+    """
+    Scheduled Task model for tracking scheduled automation rule executions.
+    """
+    
+    STATUS_CHOICES = [
+        ('pending', 'Pending'),
+        ('running', 'Running'),
+        ('completed', 'Completed'),
+        ('failed', 'Failed'),
+        ('cancelled', 'Cancelled'),
+    ]
+    
+    automation_rule = models.ForeignKey(
+        AutomationRule,
+        on_delete=models.CASCADE,
+        related_name='scheduled_tasks',
+        help_text="The automation rule this task belongs to"
+    )
+    
+    scheduled_at = models.DateTimeField(help_text="When the task is scheduled to run")
+    executed_at = models.DateTimeField(null=True, blank=True, help_text="When the task was actually executed")
+    
+    status = models.CharField(max_length=50, choices=STATUS_CHOICES, default='pending')
+    
+    # Execution results
+    result = models.JSONField(default=dict, help_text="Execution result data")
+    error_message = models.TextField(blank=True, null=True, help_text="Error message if execution failed")
+    
+    # Metadata
+    metadata = models.JSONField(default=dict, help_text="Additional metadata")
+    
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+    
+    class Meta:
+        db_table = 'igny8_scheduled_tasks'
+        ordering = ['-scheduled_at']
+        verbose_name = 'Scheduled Task'
+        verbose_name_plural = 'Scheduled Tasks'
+        indexes = [
+            models.Index(fields=['automation_rule', 'status']),
+            models.Index(fields=['scheduled_at', 'status']),
+            models.Index(fields=['account', 'status']),
+            models.Index(fields=['status', 'scheduled_at']),
+        ]
+    
+    def __str__(self):
+        return f"Scheduled task for {self.automation_rule.name} at {self.scheduled_at}"
+