Schema Validation: Metadata Validation, MongoDB Indexing, & Other Schema Columns

[ric-evans]

1. Validation:
   • Input Sanitation: defense against the bots
   • Logical Validation (path_finder.py): Ex: "Does this path already exist in the DB?"
   • Type-Validation: Ex: "is this year an integer?"
     • Within schema/validation.py utilize schema/types.py to check metadata types at runtime
     • Alternatively, use MongoDB's built-in schema validation (https://docs.mongodb.com/manual/core/schema-validation/)
2. Dynamic MongoDB Indexing:
   • Use a lookup-dict that will create/assure mongo indexes on specific fields
3. Implement/record other schema columns
   • Required Key
   • Read-Only
   • Restricted Value
   • Schema

Ideally, we would have only one lookup-dict (perhaps a yaml) that could serve as the single point of reference for all of the above

Edit: add MongoDB built-in validation note