these are all radiocarbon dates. I am not clear why Bruno has this sql looking for all methods in SEAD

create the entity
determine which method from the list at tbl_methods > 3. Dating by radiometric methods is the best match for this data set.
In the meantime, going with 148 = Radiocarbon (14C Unspecified)
Use Burno’s entity methods, which has sql to query SEAD for methods or just do a fixed values entity, and assign the right one?

YAML as of 2026-08-25

name: methods
type: entity
system_id: system_id
keys: []
columns:
  - fid
public_id: method_id
source: datasheet_v9
extra_columns:
  method: 39

```

SEAD Structure