Adjust the earliest valid time to account for the timescale period wh…

[james-d-brown]

…en conducting an evaluation in memory, #369

Description

Fixes #369.

Changes Made

Testing

Related Tickets

• Fixes As a, when running in in-memory mode, I want valid dates pools to account for rescaling period in order to ensure I get all expected, rescaled pairs in the pools #369

Checklists

Deployment Plan (For developer use)

How does the changes affect the product?

• Feature addition
• Bug fix
• Database change

Issuer Checklist (For developer use)

You may update this checklist before and/or after creating the PR. If you're unsure about any of them, please ask, we're here to help! These items are what we are going to look for before merging your code.

• Informative and human-readable title, using the format: [_pt] PR: <description>
• Links are provided if this PR resolves an issue, or depends on another other PR
• The feature branch you're submitting as a PR is up to date
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• No Placeholder code
• Reviewers requested
• Add yourself as an assignee in the PR

Merge Checklist (For Technical Lead use only)

• If applicable, update README with major alterations