Memory reduction fixes

[springfall2008]

No description provided.

[Copilot]

Pull request overview

This PR targets memory and allocation hot-spots in Predbat’s planning and history-handling paths by reducing deep-copies, compacting cached history storage, and avoiding repeated list materialisation/hashing during scenario exploration.

Changes:

• Switch str2time to prefer datetime.fromisoformat() (with strptime fallback) and add targeted unit tests.
• Introduce a compact EntityHistory columnar store for HA history caching, replacing prior deep-copy behavior and updating HAHistory tests accordingly.
• Reduce planner allocation/log volume via incremental scenario hashing and gating detailed per-slot logs behind debug_enable.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
coverage/cases/predbat_debug_pre_saving1.yaml.expected.json	Updates expected regression output after planning/history changes.
apps/predbat/utils.py	Adds fromisoformat fast-path for time parsing and routes callers through str2time().
apps/predbat/unit_test.py	Registers the new str2time test.
apps/predbat/tests/test_str2time.py	Adds coverage for str2time parsing behavior across formats and modes.
apps/predbat/tests/test_single_debug.py	Enables a faster, quieter regression-test path by toggling debug/kernel flags.
apps/predbat/tests/test_hahistory.py	Updates tests for the new EntityHistory storage and adds dedicated store tests.
apps/predbat/plan.py	Adds incremental scenario hashing to avoid copying/hashing full limit lists; gates detailed logs on debug_enable.
apps/predbat/inverter.py	Allows minute_data to mutate history in specific paths to avoid deep-copy overhead.
apps/predbat/ha.py	Implements EntityHistory and updates HAHistory caching/pruning/merge behavior to use the compact store.