Add invalid_uid_lei validation

[hkeeler]

Add validation to handle invalid_uid_lei

Acceptance Criteria:

• invalid_uid_lei validation has been added
• Passing validations on good/bad test data

[aharjati]

from our dev-touchpoint-meeting, this validation should take in list of valid LEIs and then use the list to verify existing LEI validity

[hkeeler]

In most cases it shouldn't be a list, just a single value that's the LEI for the institution doing the filing. However, there may be scenarios where an institution changes its LEI mid-year (mergers, etc.), resulting in multiple valid LEIs. We should probably chat with David if that's a possibility. If yes, that likely complicates things, and we'd need a way of resolving the current institution's LEI with other LEIs that'd also be valid for them for a filing year.

[hkeeler]

Got confirmation that this validation really is as simple as it reads.

The first 20 characters of the 'unique identifier' should match the Legal Entity Identifier (LEI) for the financial institution.

So, the question is how do we pass the institution's LEI into Pandera's schema? In previous discussion, we said we'd just make that Check settings be dynamic. However, sblar_schema is statically set and referenced directly. To make this dynamic, we're probably going to need a wrapper class so we can pass the LEI value into it.

Alternatively, we'd talked about creating a "validation context", perhaps using a thread local or contextvar. We'd rather not go that way as it's kinda "magic", and trickier to write tests for.

[hkeeler]

I know we'd talked about adding the skip validation logic here on this issue, but it's not really directly related to the validation. It really comes into play when we users want to validate anonymously, like on validation #29. We could work on that there, or a separate issue.

[nargis-sultani]

I think being able to skip this validation logic is already added here.

[nargis-sultani]

@aharjati Can you please comment on what you really wanted to confirm regarding this?