Now I can see the issue! Looking at the `TransactionTimelineService.calculateActivePositions` method, the problem is in the logic for determining which positions are truly "active" (still held). 

The issue is that the service is creating active positions for any buy transaction that has remaining shares, but it's not properly accounting for the fact that some lots may be **fully closed** even if they show positive remaining shares due to calculation errors or rounding issues.

Looking at your screenshot, I can see positions showing:

- "P/L: -$1,563.49" with "Mkt Value: $0.00" 

- "P/L: -$6,866.46" with "Mkt Value: $0.00"

- "P/L: -$479.36" with "Mkt Value: $940.20"

The first two entries show $0.00 market value, which means they have 0 shares but are still being classified as active positions. This is the bug.

Let me fix the `TransactionTimelineService` to properly filter out positions with zero or negligible shares:

And then Alex made a suggested change (patch set).  All I need to do is click the tiny Accept button.  And compile and tests.

Alex follows up the conversation (mostly one sided - his side) with a summary.

This fix addresses the issue by:

1. Stricter tolerance: Changed from 0.01 to 0.1 shares as the minimum threshold for considering a position "active"

2. Input validation: Added checks to ensure the buy transaction has valid data (shares > 0, price > 0, total > 0) before processing

3. Final validation filter: Added a `compactMapValues` operation that removes any positions that end up with invalid data:

   - Shares must be > 0.1

   - Average price must be > 0 

   - Total cost must be > 0

4. Better logging: Added debug logs to help identify when positions are being filtered out

This should eliminate the "Active Lot" entries that show $0.00 market value, as they represent closed positions that were incorrectly classified as active due to rounding errors or calculation issues in the lot matching system.

The positions showing negative P/L with actual market value (like the -$479.36 with $940.20 market value) are legitimate active positions that are currently underwater, so those will remain correctly displayed.

This is moderning Application Design & Creation.  No longer about coding / programming.  No longer about crafting a constraining engineered prompt.  It's having a productive conversation with a competent developer about what you want or in this bug example about what you don't want.