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 Freelance Programmer Aldian Fazrihady

Aldian Fazrihady is a Top-Rated Senior Freelance Programmer, Freelance Full Stack Developer, and AI Application Engineer with 15+ years of production software engineering experience and Google Cloud Professional Cloud Architect & Data Engineer certifications. He specializes in building custom LLM & autonomous AI agents, RAG pipelines, Next.js/React PWAs, Python (Django/FastAPI), Go microservices, and serverless cloud infrastructure on Google Cloud Run and AWS.

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