Subscription dashboard improvements, AI text generation limit, and other fixes.

backend/database/migrations/add_user_id_to_task_execution_logs.sql

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+-- Migration: Add user_id column to task_execution_logs for user isolation
+-- Date: 2025-01-XX
+-- Purpose: Enable user isolation tracking in scheduler task execution logs
+
+-- Add user_id column (nullable for backward compatibility with existing records)
+ALTER TABLE task_execution_logs 
+ADD COLUMN user_id INTEGER NULL;
+
+-- Create index for efficient user filtering and queries
+CREATE INDEX IF NOT EXISTS idx_task_execution_logs_user_id 
+ON task_execution_logs(user_id);
+
+-- Create composite index for common query patterns (user_id + status + execution_date)
+CREATE INDEX IF NOT EXISTS idx_task_execution_logs_user_status_date 
+ON task_execution_logs(user_id, status, execution_date);
+
+-- Note: Backfilling existing records would require joining with monitoring_tasks 
+-- and enhanced_content_strategies tables. This can be done in a separate migration
+-- or during a maintenance window. For now, existing records will have user_id = NULL.
+