2026-08-19 01:09:41 +02:00
<!doctype html>
< html lang = "en" > < meta charset = "utf-8" >
2026-08-31 21:34:23 +02:00
< meta name = "policy-source-revision" content = "e5f3497337575e1fd85fe2bfde5b2183c690d94e" >
2026-08-19 01:09:41 +02:00
< meta name = "policy-source-digest" content = "cfc0ad202c2eeeefd963127ff1defa127c715c001ecc684ab8759733bd8fb9f8" >
< title > ADR-0002 — S3 owns the placement rule; the package repo owns the number< / title >
< style >
:root{
--paper:#EDEEF0; --surface:#F6F7F8; --surface-2:#E4E6E9;
--ink:#171D24; --ink-2:#4A5561; --ink-3:#737E8A;
--rule:#D3D7DC; --rule-strong:#B6BCC3;
--brass:#8A6A2E; --brass-soft:#EFE5CD; --brass-line:#C9AE74;
--clay:#8A3A2C; --clay-soft:#F2DFDA;
--l0:#DCE0E2; --l1:#B9C4C7; --l2:#8CA1A6; --l3:#567D84; --l4:#23555E;
--chip-fg:#F6F7F8;
--font-display:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
--font-body:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
--font-mono:ui-monospace,"SF Mono","Cascadia Code",Menlo,Consolas,monospace;
--measure:66ch;
}
@media (prefers-color-scheme:dark){
:root:not([data-theme="light"]){
--paper:#12161A; --surface:#191E24; --surface-2:#222831;
--ink:#E6E9EC; --ink-2:#A3ADB7; --ink-3:#78838E;
--rule:#2A3138; --rule-strong:#3B444D;
--brass:#C9A45C; --brass-soft:#33290F; --brass-line:#6B5426;
--clay:#D08A76; --clay-soft:#3A211B;
--l0:#262C32; --l1:#35424A; --l2:#4A626B; --l3:#6A939D; --l4:#97C4CD;
--chip-fg:#12161A;
}
}
:root[data-theme="dark"]{
--paper:#12161A; --surface:#191E24; --surface-2:#222831;
--ink:#E6E9EC; --ink-2:#A3ADB7; --ink-3:#78838E;
--rule:#2A3138; --rule-strong:#3B444D;
--brass:#C9A45C; --brass-soft:#33290F; --brass-line:#6B5426;
--clay:#D08A76; --clay-soft:#3A211B;
--l0:#262C32; --l1:#35424A; --l2:#4A626B; --l3:#6A939D; --l4:#97C4CD;
--chip-fg:#12161A;
}
*{box-sizing:border-box}
body{
margin:0; background:var(--paper); color:var(--ink);
font-family:var(--font-body); font-size:17px; line-height:1.62;
-webkit-font-smoothing:antialiased;
}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px 96px}
.layout{display:grid;grid-template-columns:180px minmax(0,1fr);gap:56px;align-items:start}
@media (max-width:960px){.layout{grid-template-columns:1fr;gap:0}.rail{display:none}}
/* ---------- rail ---------- */
.rail{position:sticky;top:28px;padding-top:8px;font-family:var(--font-display);font-size:12px;line-height:1.5}
.rail ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px}
.rail a{color:var(--ink-3);text-decoration:none;display:flex;gap:9px}
.rail a:hover,.rail a:focus-visible{color:var(--brass)}
.rail .n{font-family:var(--font-mono);font-size:10px;color:var(--rule-strong);min-width:16px;padding-top:1px}
.rail .grp{margin-top:14px;font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--rule-strong)}
/* ---------- header ---------- */
header{padding:64px 0 40px;border-bottom:2px solid var(--ink);margin-bottom:44px}
.eyebrow{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);display:flex;flex-wrap:wrap;gap:14px;margin-bottom:22px}
.eyebrow .stat{color:var(--clay)}
h1{font-family:var(--font-display);font-weight:800;letter-spacing:-.035em;line-height:.94;font-size:clamp(46px,9vw,92px);margin:0 0 6px;text-wrap:balance}
.sub{font-family:var(--font-display);font-weight:500;font-size:clamp(16px,2.4vw,21px);letter-spacing:-.01em;color:var(--ink-2);margin:0 0 30px;max-width:34ch;line-height:1.3}
.metagrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px 28px;border-top:1px solid var(--rule);padding-top:20px}
.metagrid dt{font-family:var(--font-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);margin-bottom:5px}
.metagrid dd{margin:0;font-family:var(--font-display);font-size:13.5px;line-height:1.45;color:var(--ink)}
/* ---------- typography ---------- */
section{margin-bottom:60px;scroll-margin-top:24px}
h2{font-family:var(--font-display);font-weight:750;letter-spacing:-.022em;font-size:clamp(24px,3.4vw,31px);line-height:1.12;margin:0 0 18px;text-wrap:balance;display:flex;gap:14px;align-items:baseline}
h2 .sn{font-family:var(--font-mono);font-size:12px;font-weight:400;color:var(--brass);letter-spacing:.06em;flex:none;padding-top:2px}
h3{font-family:var(--font-display);font-weight:700;font-size:16px;letter-spacing:-.008em;margin:34px 0 10px;color:var(--ink)}
p{margin:0 0 15px;max-width:var(--measure)}
ul,ol{max-width:var(--measure);margin:0 0 15px;padding-left:20px}
li{margin-bottom:7px}
strong{font-weight:600}
em{font-style:italic}
code{font-family:var(--font-mono);font-size:.855em;background:var(--surface-2);padding:1px 5px;border-radius:2px}
a{color:var(--brass)}
.lede{font-size:19px;line-height:1.55;color:var(--ink-2);max-width:60ch}
/* ---------- devices ---------- */
.callout{border-left:3px solid var(--brass);background:var(--brass-soft);padding:18px 22px;margin:0 0 24px;max-width:var(--measure)}
.callout p:last-child{margin-bottom:0}
.callout .lbl{font-family:var(--font-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--brass);display:block;margin-bottom:8px}
.rule-quote{border-top:2px solid var(--ink);border-bottom:2px solid var(--ink);padding:26px 0;margin:28px 0;max-width:var(--measure)}
.rule-quote p{font-family:var(--font-display);font-weight:600;font-size:19px;line-height:1.38;letter-spacing:-.014em;margin:0;text-wrap:balance}
.hard{border-left:3px solid var(--clay);background:var(--clay-soft);padding:18px 22px;margin:0 0 24px;max-width:var(--measure)}
.hard .lbl{font-family:var(--font-mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--clay);display:block;margin-bottom:8px}
.hard p:last-child{margin-bottom:0}
.dec{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;color:var(--brass);text-transform:uppercase}
.vec{font-family:var(--font-mono);font-size:.9em;font-weight:600;background:var(--surface-2);padding:2px 7px;border-radius:2px;white-space:nowrap;letter-spacing:.04em}
/* ---------- tables ---------- */
.scroll{overflow-x:auto;margin:0 0 24px;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;min-width:520px;font-family:var(--font-display);font-size:13.5px;line-height:1.45}
th{text-align:left;font-family:var(--font-mono);font-size:9.5px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);font-weight:400;padding:0 16px 8px 0;border-bottom:1px solid var(--rule-strong);vertical-align:bottom}
td{padding:11px 16px 11px 0;border-bottom:1px solid var(--rule);vertical-align:top;color:var(--ink-2)}
td:first-child{color:var(--ink);font-weight:600}
tbody tr:last-child td{border-bottom:none}
.lvl{font-family:var(--font-mono);font-weight:600;font-size:12px;letter-spacing:.04em;color:var(--ink)}
/* ---------- ladders ---------- */
.breakout{margin:34px 0 40px}
.bhead{display:flex;justify-content:space-between;align-items:baseline;gap:20px;border-bottom:1px solid var(--rule-strong);padding-bottom:9px;margin-bottom:22px;flex-wrap:wrap}
.bhead h3{margin:0;font-size:13px;letter-spacing:.1em;text-transform:uppercase;font-family:var(--font-mono);font-weight:400;color:var(--ink-3)}
.bhead .note{font-family:var(--font-display);font-size:12.5px;color:var(--ink-3)}
.ladders{display:grid;gap:26px}
.ladder{display:grid;grid-template-columns:126px minmax(0,1fr);gap:18px;align-items:start}
@media (max-width:700px){.ladder{grid-template-columns:1fr;gap:10px}}
.ladder .pname{font-family:var(--font-display);font-weight:700;font-size:14px;letter-spacing:-.01em;padding-top:2px}
.ladder .pname span{display:block;font-family:var(--font-mono);font-size:10px;font-weight:400;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin-top:3px}
.rungs{display:grid;gap:3px;grid-template-columns:repeat(5,minmax(0,1fr))}
@media (max-width:700px){.rungs{grid-template-columns:repeat(2,minmax(0,1fr))}}
.rung{padding:9px 10px 11px;background:var(--surface);border-top:4px solid var(--l0);min-width:0}
.rung.r1{border-top-color:var(--l1)} .rung.r2{border-top-color:var(--l2)}
.rung.r3{border-top-color:var(--l3)} .rung.r4{border-top-color:var(--l4)}
.rung .code{font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.06em;color:var(--ink);display:block;margin-bottom:4px}
.rung .txt{font-family:var(--font-display);font-size:11.5px;line-height:1.34;color:var(--ink-2);display:block}
.rung.na{opacity:.42}
/* ---------- matrix ---------- */
.matrix-shell{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:stretch;margin-bottom:14px}
.ylab{writing-mode:vertical-rl;transform:rotate(180deg);font-family:var(--font-mono);font-size:9.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);text-align:center;padding-bottom:22px}
.mgrid{display:grid;grid-template-columns:34px repeat(5,minmax(0,1fr));gap:3px}
.mcell{background:var(--surface);min-height:60px;padding:6px;display:flex;flex-direction:column;justify-content:flex-end;gap:4px;min-width:0}
.mcell.tint1{background:color-mix(in srgb,var(--l1) 26%,var(--surface))}
.mcell.tint2{background:color-mix(in srgb,var(--l2) 26%,var(--surface))}
.mcell.tint3{background:color-mix(in srgb,var(--l3) 24%,var(--surface))}
.mcell.tint4{background:color-mix(in srgb,var(--l4) 22%,var(--surface))}
.mcell.void{background:repeating-linear-gradient(135deg,transparent,transparent 5px,var(--rule) 5px,var(--rule) 6px);opacity:.55}
.rlab,.clab{font-family:var(--font-mono);font-size:10px;font-weight:600;letter-spacing:.05em;color:var(--ink-3);display:flex;align-items:center;justify-content:center}
.rlab{min-height:60px}
.clab{padding-top:7px;min-height:22px}
.pin{font-family:var(--font-mono);font-size:9.5px;font-weight:600;letter-spacing:.02em;background:var(--ink);color:var(--paper);padding:2px 5px;border-radius:2px;line-height:1.3;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pin.ghost{background:transparent;color:var(--ink-2);border:1px dashed var(--rule-strong)}
.mnote{display:flex;gap:22px;flex-wrap:wrap;font-family:var(--font-display);font-size:12px;color:var(--ink-3);padding-top:6px}
.mnote .k{display:flex;align-items:center;gap:7px}
.sw{width:13px;height:13px;flex:none;background:var(--ink)}
.sw.g{background:transparent;border:1px dashed var(--rule-strong)}
.sw.v{background:repeating-linear-gradient(135deg,transparent,transparent 4px,var(--rule) 4px,var(--rule) 5px);border:1px solid var(--rule)}
@media (max-width:640px){
.mgrid{grid-template-columns:28px repeat(5,minmax(0,1fr))}
.mcell{min-height:52px;padding:4px}
.pin{font-size:8px;padding:1px 3px}
.rlab{min-height:52px}
}
/* ---------- methodology ---------- */
.verbs{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:2px;background:var(--rule);border:1px solid var(--rule)}
.verb{background:var(--surface);padding:18px 18px 20px}
.verb h4{font-family:var(--font-display);font-weight:750;font-size:15px;margin:0 0 7px;letter-spacing:-.01em}
.verb p{font-family:var(--font-display);font-size:12.5px;line-height:1.46;color:var(--ink-2);margin:0;max-width:none}
.verb .step{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.13em;color:var(--brass);display:block;margin-bottom:9px}
/* ---------- questions ---------- */
.qs{display:flex;flex-direction:column;gap:0;border-top:1px solid var(--rule-strong)}
.q{display:grid;grid-template-columns:34px minmax(0,1fr) 170px;gap:18px;padding:16px 0;border-bottom:1px solid var(--rule);align-items:start}
@media (max-width:760px){.q{grid-template-columns:28px minmax(0,1fr);gap:12px}.q .owner{grid-column:2}}
.q .qn{font-family:var(--font-mono);font-size:11px;color:var(--brass);padding-top:3px}
.q .qt{font-family:var(--font-display);font-size:14px;line-height:1.48;color:var(--ink-2)}
.q .qt b{color:var(--ink);font-weight:700;display:block;margin-bottom:2px;font-size:14.5px}
.owner{font-family:var(--font-mono);font-size:10px;letter-spacing:.05em;color:var(--ink-3);padding-top:4px}
.owner .tag{display:inline-block;border:1px solid var(--rule-strong);padding:2px 7px;border-radius:2px}
.owner .tag.need{border-color:var(--clay);color:var(--clay)}
/* ---------- misc ---------- */
.numbers{font-family:var(--font-mono);font-size:12.5px;line-height:1.85;background:var(--surface);border-left:3px solid var(--l3);padding:16px 20px;margin:0 0 22px;overflow-x:auto;max-width:var(--measure)}
.numbers .v{color:var(--ink);font-weight:600}
.numbers .k{color:var(--ink-3)}
pre{font-family:var(--font-mono);font-size:12.5px;line-height:1.68;background:var(--surface);border-left:3px solid var(--rule-strong);padding:16px 20px;overflow-x:auto;margin:0 0 22px;max-width:var(--measure);color:var(--ink-2)}
.alt{border-bottom:1px solid var(--rule);padding:14px 0;max-width:var(--measure)}
.alt:last-of-type{border-bottom:none}
.alt b{font-family:var(--font-display);font-size:14px;display:block;margin-bottom:3px}
.alt p{font-size:14.5px;margin:0;color:var(--ink-2)}
.alt .verdict{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--clay)}
footer{border-top:2px solid var(--ink);margin-top:20px;padding-top:22px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--ink-3);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.tm td,.tm th{text-align:center}
.tm td:first-child,.tm th:first-child{text-align:left}
.yes{color:var(--l4);font-weight:700}
.no{color:var(--clay);font-weight:700}
.kind{font-family:var(--font-mono);font-size:9px;letter-spacing:.09em;text-transform:uppercase;padding:2px 6px;border-radius:2px;white-space:nowrap;border:1px solid var(--rule-strong);color:var(--ink-3)}
.kind.adv{border-color:var(--clay);color:var(--clay)}
.routes{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:2px;background:var(--rule);border:1px solid var(--rule);margin:0 0 22px}
.route{background:var(--surface);padding:16px 18px}
.route h4{font-family:var(--font-display);font-weight:750;font-size:14px;margin:0 0 6px}
.route p{font-family:var(--font-display);font-size:12.5px;line-height:1.45;color:var(--ink-2);margin:0;max-width:none}
.route .tag{font-family:var(--font-mono);font-size:9px;letter-spacing:.1em;text-transform:uppercase;color:var(--brass);display:block;margin-bottom:8px}
a:focus-visible,.rail a:focus-visible{outline:2px solid var(--brass);outline-offset:3px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
< / style >
2026-08-31 21:34:23 +02:00
< div class = "wrap" > < header > < div class = "eyebrow" > < span > RPLAT-ADR-0002< / span > < span class = "stat" > proposed · 1.0< / span > < span > railiance-platform< / span > < span > reviewed 2026-08-17< / span > < span > generated from canonical source — do not edit< / span > < / div > < h1 > ADR-0002 — S3 owns the placement rule; the package repo owns the number< / h1 > < p class = "sub" > Source: < code > railiance-platform · docs/adr/ADR-0002-placement-policy-ownership.md · e5f3497337575e1fd85fe2bfde5b2183c690d94e< / code > < / p > < p class = "sub" > Review due: 2027-02-17< / p > < / header > < div class = "layout" > < nav class = "rail" aria-label = "Sections" > < ol > < li > < a href = "#context" > < span class = "n" > ·< / span > Context< / a > < / li > < li > < a href = "#decision" > < span class = "n" > ·< / span > Decision< / a > < / li > < li > < a href = "#consequences" > < span class = "n" > ·< / span > Consequences< / a > < / li > < li > < a href = "#alternatives-considered" > < span class = "n" > ·< / span > Alternatives considered< / a > < / li > < / ol > < / nav > < main > < section id = "context" > < h2 > Context< / h2 >
2026-08-19 01:09:41 +02:00
< p > An earlier draft of < code > net-kingdom/canon/standards/tenancy-posture_v0.1.md< / code > §8.2 proposed that database placement policy — dedicated versus shared, and when that changes — be owned by < code > railiance-platform< / code > , co-signed by < code > adaptive-pricing< / code > . < code > tenant-engine< / code > raised the same gap independently on 2026-08-16: both patterns are live on railiance01, neither is written down, and each new service copies whichever neighbour it looked at.< / p >
< p > The complication is that this repo no longer holds the specs. < code > RAILIANCE-WP-0012< / code > and < code > RAILIANCE-WP-0015< / code > moved the deployable surface to the < code > rapp-*< / code > repos. < code > platform-pg< / code > 's < code > instances< / code > , < code > max_connections< / code > , memory limit and retention are < code > rapp-postgres< / code > 's cluster CR. Tenancy Posture §19.8 nonetheless asks < em > this repo< / em > for < code > platform-pg< / code > 's declared maximum size — a question one hop from where its answer lives.< / p >
< p > Accepting ownership without stating this would produce either an answer we cannot substantiate or a quiet non-answer.< / p >
< / section >
< section id = "decision" > < h2 > Decision< / h2 >
< p > < strong > Accept placement ownership, split along rule and number.< / strong > < / p >
< p > < em > This repo owns the rule:< / em > the default placement level, what overrides it, who is accountable for each workload's placement, that a shared cluster must publish a ceiling and an overflow target before its third consumer, that retention has a floor and a ceiling, and that a consumer's erasure horizon on shared substrate is disclosed rather than inherited silently.< / p >
< p > < em > The package repo owns the number:< / em > what the ceiling actually is, which resource binds first, what the retention values are, and the validator that enforces them where the CR lives.< / p >
< p > < strong > Placement ownership per workload sits with the consuming repo; this repo co-signs.< / strong > The consumer knows its latency requirement, erasure horizon and compliance position; S3 knows the substrate. A placement change needs both. Putting the decision solely here would recreate the problem §8.2 exists to avoid — an operations-shaped repo holding a commercial decision alone.< / p >
< p > < code > adaptive-pricing< / code > declined the standing co-signature on 2026-08-17. The replacement is binding and machine-reconcilable: it publishes typed tier minimums; this policy validates placement against them. Ownership stays here.< / p >
< / section >
< section id = "consequences" > < h2 > Consequences< / h2 >
< ul > < li > < code > docs/placement-policy.md< / code > is the operative document; this ADR is the decision behind it.< / li > < li > §19.8 is answered for < code > platform-pg< / code > by < code > rapp-postgres< / code > ADR-0004: four consumers, with < code > platform-pg-2< / code > named as the still-absent overflow target. Rule P-4.1 still requires < code > apps-pg< / code > to declare its own ceiling before its third consumer.< / li > < li > This repo owes < code > apps-pg< / code > 's ceiling under its own rule. A policy whose author is exempt is not a policy.< / li > < li > §8.1 requires triggers to be < em > monitored< / em > . This repo has no monitoring plane, so the connection-and-memory-ceiling trigger is recorded < code > unmonitored< / code > pending < code > railiance-telemetry< / code > . Declaring a ceiling is a partial substitute — a written threshold is checkable by a human at provisioning, which beats a limit discovered by an OOM kill.< / li > < li > < code > adaptive-pricing< / code > 's decline is recorded as single policy ownership plus a mandatory typed constraint join, not as an absent signature.< / li > < / ul >
< / section >
< section id = "alternatives-considered" > < h2 > Alternatives considered< / h2 >
< p > < strong > Decline ownership; route it to < code > rapp-postgres< / code > .< / strong > They hold the specs and the operational knowledge. Rejected: placement is a cross-cluster question and < code > rapp-postgres< / code > owns one package. A policy owned by one substrate's operator cannot govern movement between substrates.< / p >
< p > < strong > Accept whole, including the numbers.< / strong > Rejected: it would either re-import the deployable surface this repo deliberately gave up, or produce numbers restated here that drift from the CR — a second source of truth for exactly the values a consumer must be able to trust.< / p >
2026-08-31 21:34:23 +02:00
< / section > < footer > < span > RPLAT-ADR-0002 · 1.0 · proposed< / span > < span > railiance-platform · docs/adr/ADR-0002-placement-policy-ownership.md · e5f3497337575e1fd85fe2bfde5b2183c690d94e< / span > < / footer > < / main > < / div > < / div > < / html >
