TL;DR: If you want to stop old transactions from being re-imported via API or blockchain import, set a start date. This tells CoinTracking to only import transactions from that date onward.
Why set a start date?
API and blockchain imports automatically refresh every 24 hours. If you delete a transaction from one of these imports, it will be re-imported during the next update unless you:
Set the importer to manual mode (API imports only)
Set a start date to prevent older transactions from being pulled in again
How to set a start date
Go to the API or blockchain importer page
Click "Edit" next to your import job
Enter the desired start date
Click "Update"
Now, CoinTracking will only import transactions from that date forward. Any transactions already imported from before that date will stay in your account until you delete them manually.
Handling reoccurring duplicate transactions
If your import includes duplicate transactions from the exchange:
Use the Transaction ID (TX ID) check via the "Manage Columns" setting in the Trade List (Full View)
Manually delete or zero out the duplicates by editing them (set all values to zero, leave the date intact)
Set a new start date to prevent older duplicate entries from reappearing
For more strategies, see: How to avoid unwanted transactions or SCAM tokens via API jobs?.
Summary
To cleanly manage imports and stop undesired transactions from returning, always set a start date when refining API or blockchain jobs. Use manual edits and filters to handle duplicates when needed.