docs(wiki): update index + log for booth console, drawer, and tariff research

Catalog the new concept/source pages and append chronological log entries for the
tariff research, live WebSocket, booth pay/exit, active sessions, and shift drawer
work.

wiki/index.md

@@ -7,7 +7,7 @@ updated: 2026-06-14
 # Index
 
 Content catalog for the wiki. Start at [[overview]]. Maintained on every ingest.
-Counts: 3 sources · 19 entities · 25 concepts · 5 decision records.
+Counts: 4 sources · 19 entities · 27 concepts · 5 decision records.
 
 ## Overview & navigation
 - [[overview]] — the top-level synthesis and entry point.
@@ -18,6 +18,7 @@ Counts: 3 sources · 19 entities · 25 concepts · 5 decision records.
 - [[parking-system-architecture]] — design notes: stack, threat model, devices, UHPPOTE, ESP32, readers, BOM, open decisions.
 - [[gee-qr-er80]] — datasheet: GEE QR access reader (QR/DM/1D; Wiegand/RS-232/485/USB/TCP; Linux).
 - [[qrcode-sdk]] — QRCode SDK v1.6.5: the reader's HTTP-GET-poll protocol + JSON verdict (beep/output).
+- [[parksql2017-legacy-schema]] — predecessor SQL Server schema (Albanian market): legacy tariff/discount/membership/shift/fiscal model; confirms blocks, adds time-windows + categories, lacks postpaid sponsors.
 
 ## Entities — technology stack
 - [[technology-stack]] — the full stack table; all MIT/Apache/BSD, chosen to avoid lock-in.
@@ -78,11 +79,13 @@ Counts: 3 sources · 19 entities · 25 concepts · 5 decision records.
 ## Concepts — business domain
 - [[parking-session]] — the core domain entity; a projection over the signed log, never a mutable table.
 - [[tariff]] — fee model; pure, data-driven, offline; pay-on-foot adds a walk-back grace window.
+- [[tariff-time-tiers]] — design: happy-hour/off-peak/weekend/seasonal + vehicle categories via time-windowed rate cards.
 - [[shift]] — manned-only accountability period; explicit Start/End (not time-based); End → signed + printed Z-report (cash + POS).
 - [[capacity-occupancy]] — live count = open sessions; refuse entry + FULL sign when full (soft policy); exit never blocked.
 - [[site-metadata]] — optional park identity (name, operator, VAT, address, contact) in site_config; feeds the ticket header.
 - [[valet-overcapacity]] — "full" is soft: operator may valet-accept over capacity (keys handed over, custody). Manned, deferred.
 - [[validation-discounts]] — merchant validates a ticket → signed discount event applied at fee time.
+- [[validation-sponsorship]] — design: sponsor accounts + postpaid B2B (customers park free, business billed monthly); not a permit.
 - [[reporting-analytics]] — revenue/occupancy/stay reports + plate-search, all projections over the signed log.
 - [[clock-integrity]] — fees depend on the host clock; detect/flag backdating on an offline box.
 - [[ticket-encoding]] — transient ticket id as QR; printed at entry, scanned at pay station + exit; plate-as-ticket alt.