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Ahmad Humayun
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Data Pipelines & Migrations

Database Migration and Email Automation

Python and SQL workflows for reporting database migration, schema preservation, backup helpers, and email-related automation.

Reporting Platform · Solo · Selected work

My role & contribution

Engineering work for this individual freelance engagement.

The problem

Built migration and automation workflows for a reporting platform where moving data safely mattered more than simply copying rows. The work included Python migration scripts, schema SQL, reporting-domain query files, backup helpers, and mail workflow scripts.

Database Migration and Email Automation
Illustrative project visual. Any figures shown are examples, not a statement of client results.

System flow

  1. 01

    Source inventory

    Operational databases, reporting tables, and email workflows are mapped before migration.

  2. 02

    Migration scripts

    Python and SQL workflows move or rebuild Postgres and BigQuery-style reporting tables.

  3. 03

    Domain SQL

    Reporting domains such as campaign, dashboard, ingestion, task, and CRM tables stay grouped and repeatable.

  4. 04

    Verification

    Backups, dry runs, schema checks, type checks, and email workflow tests reduce cutover risk.

Difficult problems

  • Migration work had to preserve schema shape and downstream reporting usability
  • Subtle type mismatches or missing domain tables could break dashboards after a successful copy
  • Email workflows needed controlled testing before downstream use
  • Reporting domains and table names needed controlled migration and validation

Work contributed

  • Built Python and SQL workflows for database/reporting migration
  • Organized reporting-domain SQL around repeatable migration and validation
  • Added backup helpers and mail workflow scripts
  • Defined a reusable migration pattern for CRM, task, and reporting-style tables

Supported outcome

  • Built Python and SQL workflows for database/reporting migration
  • Organized reporting-domain SQL around repeatable migration and validation
  • Added backup helpers and mail workflow scripts
  • Defined a reusable migration pattern for CRM, task, and reporting-style tables

Technologies in context

Python · SQL · PostgreSQL · BigQuery · pandas · SQLAlchemy · Cloud Storage · Email Workflows

Related services & work

Technical reading

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