Companion to the build plan. This document contains working Swift code, file-level organization, and the non-obvious engineering details that determine whether your masonry scrolls at 120Hz or stutters.
Targets iOS 17+. All samples compile under Swift 6.1 with strict concurrency checking.
A masonry layout arranges variable-height items in fixed-width columns, packing each new item into the currently-shortest column (Pinterest-style). SwiftUI has no built-in masonry, and the obvious implementations collapse under scale. This plan picks the right approach for your item count and lays out the build order.
How many items can the feed hold at once?
├─ Bounded (<~300, e.g. a profile grid)
│ → Approach A: Layout protocol
Two-store analysis of the 5am–11pm → 5am–1am schedule change. Focuses on the 2 added hours (11pm and midnight) and their net contribution after labor.
Analysis date: March 18, 2026
Data sources: TimescaleDB — store_pl_monthly, daily_store_metrics, transactions, transaction_lines
Question: Did expanding store hours pay for themselves? Store: Grangeville (62221), Pacific Northwest Analysis Period: Jan 2024 – Dec 2025 (excl. Feb 6 – Apr 12, 2025 data gap) Split Point: July 2025 (highest employee cost month)
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