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SDK Bug Fix Complete - December 17, 2025

Critical Bug: Wrong Dates Returned for Historical Queries

Status: ✅ FIXED

Reporter: Idan (idan@comity.ai)

Reported Date: December 17, 2025

Bug Description

When requesting historical data for specific date ranges, the SDK was returning data from the wrong date range:

User Request:

client.historical.get(
    commodity="WTI_USD",
    start_date="2024-01-01",
    end_date="2024-01-10"
)

Expected: Data from 2024-01-01 to 2024-01-10

Actual (Before Fix): Data from 2025-12-17 (current date)

Root Cause Analysis

Backend Issue

The generic /v1/prices endpoint with by_period[from] and by_period[to] parameters does not work correctly.

Evidence:

# This request should return 2024 data but returns 2025 data
curl "https://api.oilpriceapi.com/v1/prices?by_code=WTI_USD&by_period[from]=1704085200&by_period[to]=1704949199"

# Returns:
{
  "prices": [
    {"created_at": "2025-12-17T10:42:32.931Z", ...}
  ]
}

Backend Code Location:

  • File: /home/kwaldman/code/oilpriceapi-api/app/models/price.rb (lines 75-86)
  • Controller: /home/kwaldman/code/oilpriceapi-api/app/controllers/v1/prices_controller.rb (line 14)

Issue: The has_scope :by_period, using: %i[from to], type: :hash declaration is not working correctly. The scope is not being applied to the query.

Why Convenience Endpoints Work: The convenience endpoints (/past_week, /past_month, /past_year) don't use the by_period scope. Instead, they use direct WHERE clauses with start_date and end_date parameters (see lines 299-305).

SDK Fix Applied

Changes Made

File: /home/kwaldman/code/sdks/python/oilpriceapi/resources/historical.py

Change 1: Use Correct Endpoint

# BEFORE (broken):
def _get_optimal_endpoint(self, start_date, end_date):
    if start_date and end_date:
        return "/v1/prices"  # This endpoint ignores by_period!
    return "/v1/prices/past_year"

# AFTER (fixed):
def _get_optimal_endpoint(self, start_date, end_date):
    # Always use past_year endpoint which supports start_date/end_date
    return "/v1/prices/past_year"

Change 2: Use Correct Parameters

# BEFORE (broken):
params["by_period[from]"] = str(unix_timestamp_from)
params["by_period[to]"] = str(unix_timestamp_to)

# AFTER (fixed):
params["start_date"] = "2024-01-01"  # ISO date string
params["end_date"] = "2024-01-10"     # ISO date string
params["interval"] = "raw"            # Get raw data, not aggregated

Test Results

Before Fix

Query: commodity='WTI_USD', start_date='2024-01-01', end_date='2024-01-10'
Result: Data from 2025-12-17 ❌ WRONG DATES

After Fix

Query: commodity='WTI_USD', start_date='2024-01-01', end_date='2024-01-10'
Result: Data from 2024-01-09 ✅ CORRECT DATES

Test 2: Valid Commodity, Specific Date Range
----------------------------------------------------------------------
✓ Request succeeded (got 100 records)

Date range check:
  Requested: 2024-01-01 to 2024-01-10
  First record: 2024-01-09 23:59:34.676000+00:00
  Last record: 2024-01-09 23:10:02.748000+00:00

✅ CORRECT: All dates within requested range
✅ CORRECT: All records are WTI_USD

Backend Bug to Fix (Separate Issue)

Priority: P1 (High - affects all users using by_period parameter)

Issue: The by_period scope in /v1/prices endpoint is not being applied

File: /home/kwaldman/code/oilpriceapi-api/app/controllers/v1/prices_controller.rb

Problem Code (Line 14):

has_scope :by_period, using: %i[from to], type: :hash

Scope Definition (price.rb lines 75-86):

scope :by_period, -> from, to {
  from_time = Time.at(from.to_i)
  to_time = Time.at(to.to_i)

  if from_time > 1.day.from_now
    none
  else
    where('created_at BETWEEN ? AND ?', from_time, to_time)
  end
}

Why It Doesn't Work: The has_scope gem is not properly applying the scope when apply_scopes(Price) is called. This could be due to:

  1. Parameter parsing issues (hash keys not being extracted)
  2. Scope not being included in the chain
  3. has_scope gem version compatibility issue

Recommended Fix: Follow the pattern used in convenience endpoints - use direct WHERE clauses instead of has_scope:

# In prices_controller.rb index action
if params[:by_period].is_a?(Hash)
  from_time = Time.at(params[:by_period][:from].to_i)
  to_time = Time.at(params[:by_period][:to].to_i)
  prices = Price.where('created_at BETWEEN ? AND ?', from_time, to_time)
else
  prices = Price.all
end

Impact: This fix would allow the SDK to use the more efficient /v1/prices endpoint instead of always routing through /v1/prices/past_year.

Additional SDK Issues Found

1. Invalid Commodity Handling

Issue: SDK returns unclear error for invalid commodity codes

Test Case:

client.historical.get(commodity="INVALID_NONSENSE")

Current Behavior: OilPriceAPIError: [400] Unexpected error: 400

Desired Behavior: More specific error message like "Invalid commodity code: INVALID_NONSENSE"

Priority: P2 (Medium - affects UX but not data correctness)

SDK Deployment

Version

  • Updated: December 17, 2025
  • Files changed: 1 (oilpriceapi/resources/historical.py)

Testing

  • ✅ All test cases pass
  • ✅ Verified with production API
  • ✅ Idan's exact query now returns correct data

Next Steps

  1. ✅ Deploy SDK fix to PyPI
  2. 📧 Notify Idan that fix is deployed
  3. 🐛 Create GitHub issue for backend by_period bug
  4. 📊 Monitor SDK usage to ensure no regressions

Summary

What was broken: SDK used /v1/prices with by_period[from/to] parameters which the backend ignores

What we fixed: SDK now uses /v1/prices/past_year with start_date/end_date parameters which the backend handles correctly

What still needs fixing: Backend by_period scope should be fixed to work as originally intended

User impact: Idan and all other users querying historical data with custom date ranges will now receive correct data