SchemaUpdateMode in AL in launch.json:
Introduction: At the time of publishing the extension, in “launch.json”, there is setting “schemaUpdateMode”. By default value is “Synchronize” mode but they have two more settings, names are “Recreate” & “ForceSync”.
(1) Synchronize: This mode is used when we want to synchronize the data with each publish.

(2) Recreate: In this mode, all table and tables extensions are recreated and sample data in respective tables and its extensions are lost.

(3) ForceSync: In this mode, you can change the schema of the tables and their extensions (eg. id of the field, name of the field, delete field).

How to Import EXCEL data in Business Central D365 Create Export to Excel Report in Business Central Creation and Usage of Temporary Table in BC D365 Page Extension Object– Microsoft Docs |