Agent jobs are not stored in the database, but as part of SQL Server itself.  After moving a CRM database to new server, you must manually recreate the jobs in CRM or use Management Studio to migrate them

See this Video for tips on migrating with Management Studio:
  1. Use Object Explorer details in the old SQL Server
  2. Shift click to select multiple jobs then select the jobs ending in “(BBInfinity)” as these are job schedules generated in the front-end of CRM
  3. Right click and select Script jobs as CREATE
  4. Run the generated script on the new SQL Server

Two actions are required before running the script:

1. After the jobs were scripted, they have to be adjusted for different login before running on a new server, @owner_login_name.
2. In the script, adjust URL to avoid pointing to the old environment.