feat: sse && multi_merchant completed

stateflow/admin.py

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+from django.contrib import admin
+
+# Register your models here.

stateflow/apps.py

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+from django.apps import AppConfig
+
+
+class StateflowConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'stateflow'

stateflow/models.py

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+from django.db import models
+
+# Create your models here.

stateflow/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

stateflow/views.py

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+from django.shortcuts import render
+
+# Create your views here.