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Your database schema will evolve over time. Any changes can (and probably should) be applied to your admin backend’s models.
To upgrade your models definition in your code you need to be at least in the V7 version of forest-express-sequelize or forest-express-mongoose package. If this is not the case, you need to upgrade to V7 first. See the v1 upgrade notes (SQL, MongoDB) in this legacy documentation, or jump directly to the v1 to v2 migration guide.
Now you can use the forest schema:update command to achieve your goal. This command is able to create all the missing file for a newly added table in your database. However it will not automatically modify existing files. So if you just added a new field inside an existing table, please just remove the corresponding model file inside your models folder and run the command.

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Examples

In the following example, we added a new table customers on an existing project. This is the output of the forest schema:update command. 
$ forest schema:update
✓ Connecting to your database(s)
✓ Analyzing the database(s)
  create forest/customers.js
  skip forest/staffs.js - already exist.
  skip forest/stores.js - already exist.
  create models/customers.js
  skip models/staffs.js - already exist.
  skip models/stores.js - already exist.
  create routes/customers.js
  skip routes/staffs.js - already exist.
  skip routes/stores.js - already exist.
✓ Generating your files
In the next example we just removed a field from the previous added table. After removing the model file from the models folder. This is the output of the forest schema:update command. 
$ forest schema:update
✓ Connecting to your database(s)
✓ Analyzing the database(s)
  skip forest/customers.js - already exist.
  skip forest/staffs.js - already exist.
  skip forest/stores.js - already exist.
  create models/customers.js
  skip models/staffs.js - already exist.
  skip models/stores.js - already exist.
  skip routes/customers.js - already exist.
  skip routes/staffs.js - already exist.
  skip routes/stores.js - already exist.
✓ Generating your files