Snapshots must be configured with a 'strategy' and 'unique_key'

Help
1

The problem I’m having

When i configure snapshot in a yml file, I encounter an error:

raise ValidationError(
“Snapshots must be configured with a ‘strategy’ and ‘unique_key’.”
)
dbt_common.dataclass_schema.ValidationError: Snapshots must be configured with a ‘strategy’ and ‘unique_key’.

The context of why I’m trying to do this

I am using the yml method as it’s recommended in the dbt documentation vs the config method which seems to be legacy: Snapshot configurations | dbt Developer Hub

I am running:

Core:

  • installed: 1.10.13
  • latest: 1.10.13 - Up to date!

Plugins:

  • snowflake: 1.10.2 - Up to date!

What I’ve already tried

I tried removing double quotes for my unique_key but I face the same error

Some example code or error messages

  - name: my_snapshot
    relation: source('my_source', 'my_table')
    config:
      database: my_database
      schema: my_schema
      strategy: check
      unique_key: '"S#col_a"' #I have a column with a special character hence double quotes
      check_cols: 
        - 'col_b'
      dbt_valid_to_current: to_date('9999-12-31')
      hard_deletes: new_record