fix: AI analysis history user isolation & password change Turnstile bypass

backend_api_python/migrations/add_user_id_to_analysis_memory.sql

@@ -0,0 +1,21 @@
+-- Migration: Add user_id column to qd_analysis_memory table
+-- This allows filtering analysis history by user
+-- Run this migration to update existing databases
+
+-- Add user_id column if it doesn't exist
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM information_schema.columns 
+        WHERE table_name = 'qd_analysis_memory' AND column_name = 'user_id'
+    ) THEN
+        ALTER TABLE qd_analysis_memory ADD COLUMN user_id INT;
+        
+        -- Create index for efficient user-based queries
+        CREATE INDEX IF NOT EXISTS idx_analysis_memory_user ON qd_analysis_memory(user_id);
+        
+        RAISE NOTICE 'Added user_id column to qd_analysis_memory';
+    ELSE
+        RAISE NOTICE 'user_id column already exists in qd_analysis_memory';
+    END IF;
+END $$;