Change microbatch lookback default from 0 to 1

[QMalcolm]

Resolves #10867

Problem

A lookback value of 0 results in microbatch models consistently having incomplete data.

Solution

Change the lookback default to 1. This guarantees that batches will eventually get completed (assuming the job is run once per batch_size)

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.12%. Comparing base (bdb79e8) to head (8120810).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10876      +/-   ##
==========================================
- Coverage   89.20%   89.12%   -0.08%     
==========================================
  Files         183      183              
  Lines       23464    23464              
==========================================
- Hits        20930    20913      -17     
- Misses       2534     2551      +17     

Flag	Coverage Δ
integration	86.41% <100.00%> (-0.15%)	⬇️
unit	62.06% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Unit Tests	62.06% <100.00%> (ø)
Integration Tests	86.41% <100.00%> (-0.15%)	⬇️

[QMalcolm]

Changes to schemas.getdbt.com dbt-labs/schemas.getdbt.com#68

[mirnawong1]

hey @QMalcolm , when this pr is merged, am i right in changing the docs here from 0 to1? https://docs.getdbt.com/docs/build/incremental-microbatch#relevant-configs

[QMalcolm]

hey @QMalcolm , when this pr is merged, am i right in changing the docs here from 0 to1? https://docs.getdbt.com/docs/build/incremental-microbatch#relevant-configs

That is correct 🙂

[mirnawong1]

docs pr here to address this: https://github.com/dbt-labs/docs.getdbt.com/pull/6351/files

[QMalcolm]

Something weird happened. Some commits from another one of my branches got onto this one. I assume in my delirium of spinning plates, I did something dumb.

[mirnawong1]

hey @QMalcolm ! now that this is merged, am i ok merging the docs pr so the docs are updated?