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Marc-André Bombeck
6aad4a465e
Add `User.homeSince` (nullable effective-from instant) and a `DEVICE` value to the location-source enum (migration 0219). `homeSince` records when the home location became effective so day resolution can attribute a past day to the home only on/after that instant, rather than to the current home for every past day. Existing accounts with a home get `homeSince` stamped to the migration instant; their deep past is filled by explicit location periods instead. `DEVICE` is reserved for a future client-supplied coarse per-day location: the enum value and the wire contract accept it now so the resolver can rank it later without rework. Nothing writes it server-side yet.
37 lines
1.8 KiB
SQL
37 lines
1.8 KiB
SQL
-- v1.25 (W-ENV) — conservative past-location handling for the environmental
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-- context module.
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--
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-- Adds `users.home_since` (effective-from instant for the home location) and a
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-- `DEVICE` value to the location-source enum. Day resolution attributes a past
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-- day to the home location ONLY when the day is on/after `home_since`; earlier
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-- days are skipped rather than fabricated from the current home. The deep past
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-- is filled by explicit dated location periods instead.
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--
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-- `DEVICE` is the reserved forward path for a future client-supplied coarse
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-- per-day location (iOS v2). The value exists so the resolver and the wire
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-- contract already accept it; nothing writes it server-side yet.
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--
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-- Backfill of existing accounts: any row that already has a home location gets
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-- `home_since` stamped to the migration instant. This is conservative — the
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-- exact day a pre-upgrade account moved into its home is unknown, so history
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-- before the upgrade is left to explicit location periods rather than guessed.
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--
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-- Additive; no existing weather row touched. Idempotent guards so reruns are
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-- safe on prod.
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--
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-- Reversibility (down):
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-- ALTER TABLE "users" DROP COLUMN IF EXISTS "home_since";
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-- -- (the `DEVICE` enum value cannot be dropped in place; it is inert until a
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-- -- future client writes it, so a roll-back leaves it harmless.)
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-- AlterTable: effective-from instant for the home location (nullable).
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ALTER TABLE "users" ADD COLUMN IF NOT EXISTS "home_since" TIMESTAMP(3);
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-- Backfill: stamp existing home rows so they resolve from the upgrade forward.
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UPDATE "users"
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SET "home_since" = CURRENT_TIMESTAMP
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WHERE "home_lat" IS NOT NULL AND "home_since" IS NULL;
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-- AlterEnum: reserve the DEVICE source for the iOS v2 forward path.
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ALTER TYPE "environment_location_source" ADD VALUE IF NOT EXISTS 'DEVICE';
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