Fix: Resolve Pipeline 500 Error and Improve Data Processing

[ODORA0]

🐛 Bug Fix: Pipeline 500 Error Resolution

The 'Run Pipeline' button was returning a 500 Internal Server Error, preventing the data pipeline from executing successfully.

Root Causes Identified

1. Worker Service Not Running: Python/FastAPI worker wasn't started properly
2. dbt Port Mismatch: dbt configured for port 5432, but PostgreSQL running on 5433
3. CSV Column Name Issues: Numeric column names like "1958" caused PostgreSQL syntax errors
4. dbt Model Generation: Inconsistent column naming between CSV loading and dbt models

Solutions Implemented

1. Fixed dbt Port Configuration

• Updated dbt/relayboard/profiles.yml to use port 5433 instead of 5432
• Ensures dbt can connect to PostgreSQL Docker container

2. Enhanced CSV Column Name Handling

• Added robust column name cleaning function:

  def clean_column_name(name):
      cleaned = str(name).strip().replace('"', '').replace("'", "").replace(" ", "_")
      if cleaned.isdigit() or (cleaned and cleaned[0].isdigit()):
          cleaned = f"col_{cleaned}"
      if not cleaned:
          cleaned = "unnamed_column"
      return cleaned.lower()

• Numeric column names like "1958" are now converted to col_1958

3. Improved Error Handling

• Added detailed logging and traceback information in worker
• Better error messages for debugging pipeline issues

4. Fixed dbt Model Generation

• Applied consistent column cleaning logic to dbt model generation
• Ensures staging and warehouse tables have matching column names

5. Updated .gitignore

• Added dbt build artifacts (target/, .user.yml) to prevent committing build files

Testing Results

Pipeline now works successfully!

What's Working Now

1. ** CSV Registration**: Upload CSV files to MinIO
2. ** Slack Configuration**: Set up Slack webhook destinations
3. ** Pipeline Execution**: Complete data pipeline runs successfully:
   • Downloads CSV from MinIO
   • Loads data to PostgreSQL staging schema
   • Generates dbt models automatically
   • Runs dbt transformations
   • Dispatches results to Slack

Video DEMO:

Screen.Recording.Oct.16.2025.1.1.mov