Fix OOM on Era 1 dates: chunk CSV output and pre-filter by DUID

Fix multi-segment CSV parsing so both half-day files use their own schema

Fix silent 500: add global exception handler and NaN safety

Fix TypeError in compute_summary when std() returns None

Fix missing second 12-hour half of NEM market day (AEST, not UTC)

Fix 12-hour gap in SCADA data by reading all CSVs from each inner ZIP

Fix chart truncation and CSV datetime format

Remove time boundary filter causing data truncation to a few hours

Add FPPMW monthly archive support (Mar 2025–Jan 2026) + 24h day coverage

Fix Polars schema inference: scan all rows to detect float columns

Initial implementation: NEM Battery SCADA Data Explorer