What is the best approach to track deleted records

Dear all,
We have build a CMS platform which is based on SQL server 2012 tables structure hosted in Azure.
We have build on top of this some REST API method in order to access data from any type of client application.
The issues we need to solved now is what his the best way to track deleted records in order that client application gets informed through web service about deleted data from our CMS.
We were thinking of 2 path actually :
- having a kind of Ghost table for each of our real table where deleted records will be inserted into ( physical delete ). This would mean adding as many Ghost tables as we have production tables
- Adding a IsDeleted flag to each of our table which will be set to true when a record is deleted from our CMS ( logical delete ). This would means adding an IsDelete field to each of our tables, create and update all our store procedure and web services
in order to taken in account that new filter criteria to fetch our records. Quite huge job
Will there be any other approach ?
We are looking the best solution with minimum impact on our current solution
reagards
Your knowledge is enhanced by that of others.

Hello,
@Tom, based on your question
"The question would be what do you need to do with the deleted records and how long do you need to keep them?"
When records is deleted, then I simply want to delete them and informed any client application about deleted items in order to get data in Sync. I will not have any reporting on deleted data !
The only reason of tracking delete tables items, is simply to informed client application through web service sync about the data to be ignored. Client application have a caching database records for performance reason and is is require to not used data
from that local storage which has been reported as deleted by the SQL server on Aure.
Does this make sense ?
regards
Your knowledge is enhanced by that of others.

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