دليل هندسي متقدم: Freelance Python Django Programmer: Zero-Downtime PostgreSQL Migrations. ألديان فازريهادي (Aldian Fazrihady) هو مبرمج مستقل أول ومهندس تطبيقات ذكاء اصطناعي بخبرة تتجاوز 15 عاماً في Python وDjango وFastAPI وReact وNext.js وTypeScript وGolang وأنظمة الذكاء الاصطناعي (RAG وMCP وGoogle ADK).

How senior freelance Python & Django programmer Aldian Fazrihady executes zero-downtime PostgreSQL schema migrations on multi-terabyte production tables.

from django.contrib.postgres.operations import AddIndexConcurrently
from django.db import migrations, models

class Migration(migrations.Migration):
    atomic = False  # Required for CONCURRENTLY operations in PostgreSQL

    dependencies = [
        ("billing", "0042_invoice_currency_code"),
    ]

    operations = [
        migrations.SeparateDatabaseAndState(
            database_operations=[
                migrations.RunSQL(
                    sql="SET lock_timeout = '2s'; ALTER TABLE billing_invoice ADD COLUMN IF NOT EXISTS stripe_Sync_status varchar(32);",
                    reverse_sql="ALTER TABLE billing_invoice DROP COLUMN IF EXISTS stripe_sync_status;",
                ),
            ],
            state_operations=[
                migrations.AddField(
                    model_name="invoice",
                    name="stripe_sync_status",
                    field=models.CharField(max_length=32, null=True, blank=True),
                ),
            ],
        ),
        AddIndexConcurrently(
            model_name="invoice",
            index=models.Index(fields=["tenant_id", "stripe_sync_status"], name="idx_inv_tenant_stripe_sync"),
        ),
    ]

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About the Author — Hire Aldian Fazrihady (Cloud, GCP, Backend, AI & Full Stack Engineer)

Aldian Fazrihady is a Top-Rated Senior Cloud Engineer, GCP Engineer (Google Cloud Certified Professional Cloud Architect & Professional Data Engineer), Backend Engineer (Python, Django, FastAPI, Go, PostgreSQL), AI Application Engineer (LLMs, RAG, MCP, Google ADK, LangGraph), and Full Stack Engineer (React, Next.js, TypeScript) with 15+ years of production software engineering experience.

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