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}1 # Track 05 — Data Ops: Planning Phase Plan 2 3 Lead: Priya Nandakumar (opus/high for this phase). Track directory: `05-data-ops/`. Org plan: `../PLAN.md`. Board row: `../PLANNING.md`. Rules, palette, patterns, hire procedure: `../CASTING.md`. Coordination approach: `../02-ai-security-architecture/planning-approach.md`. 4 5 ## Context 6 7 All three of the assignment's questions sit on top of one schema and one DAO contract, and this track owns both. That is the whole reason 05 is on the first-wave critical path: 03 cannot write the DAO until the contract is stable, and 04 cannot plan migration execution until the migration approach is named. 8 9 The first-wave design work already exists here as prose — `research-data-ops-best-practices.md` (sourced research), `multi-db-strategy.md` (interface contract and schema shape), `pii-governance.md` (retention and non-conflation rules). What does not exist is the thing 03 actually needs. `planning-approach.md` records my own commitment on this and Marcus adopted it project-wide: a hand-off is implementable only if the receiver can act on it **without re-deriving the sender's reasoning**. `multi-db-strategy.md` today describes `Search(ctx, query) (results []UserProfile, total int, error)` in a sentence. It does not say what `query` is, which fields are nullable, what `Update` does when the row is gone, or whether `total` is the filtered count or the page count. Renata would have to invent all of that, and inventing it is a design decision that belongs to this track, not hers. 10 11 So the deliverable this phase is aimed at is narrow and specific: turn the prose contract into a Go-shaped contract — interface signatures, field-level schema with nullability and types, error semantics, and explicit out-of-scope notes telling 03 what it must not redesign. Everything else in this plan either feeds that artifact or unblocks 04. 12 13 The planning-phase rule holds throughout: this is a Go-*shaped* contract written inside a markdown file. No `.go`, no `.sql`, no `go.mod`, until Warren's explicit go-ahead. A fenced Go block inside `multi-db-strategy.md` is the design; a file the compiler would accept is code. 14 15 ## 1. Deliverables and tasks 16 17 Six deliverables, each sized to one Jira Story under the track's Epic in project `LT`. Stories are listed in dependency order; S1 is the first Phase 3 deliverable and the one everything downstream waits on. Acceptance criterion for every story is the hand-off standard above. 18 19 ### S1 — Go-shaped contract in `multi-db-strategy.md` (the critical-path deliverable) 20 21 Extend `multi-db-strategy.md` in place — it stays the single source of truth, no new parallel doc. Adds, as fenced Go-shaped blocks and tables rather than prose: 22 23 - **Interface signatures** for `ProfileRepository`, `CredentialRepository`, `AuthMethodRepository` — exact method names, parameter and return types, and the `ProfileQuery` / `ProfileSearchResult` types `Search` takes and returns (shape ruled in S2). 24 - **Error semantics**, which today are one sentence about `ErrNotFound`. Needs the full sentinel set and when each is returned: `ErrNotFound`, `ErrDuplicateUsername` (unique-constraint violation on `user_credential.username`, which both backends must translate out of their driver-specific error into the shared sentinel), `ErrInvalidMethod` (FK violation on `method_id`), and the rule that everything else is wrapped with `%w` and passed through. Also: does `Update` on a missing row return `ErrNotFound` or upsert-create? (My position going in: `Update` is a portable upsert per the existing doc, so it creates — which means the doc must say so loudly, because "Update creates" is exactly the surprise that produces a bug in 03.) 25 - **Field-level schema table per entity** — column, Go type, SQL type per backend family, nullable yes/no, constraint, and a one-line note. Nullability is where this contract is most likely to be wrong and most expensive to fix, so it gets its own reviewer (S3). 26 - **Context and cancellation**: every method takes `ctx` first and is expected to honour cancellation; no method holds a transaction across calls. If the service layer needs a multi-statement transaction, that is a follow-up on the contract, not something 03 improvises — stated explicitly. 27 - **Explicitly out of scope for 03** — a numbered list so there is no ambiguity about what 03 must not redesign: the PII/credential separation (governance control, `pii-governance.md`), the UUID-everywhere PK strategy, the `auth_method` lookup table rather than a native enum, the `ON CONFLICT DO UPDATE` upsert form, the documented SQLite fuzzy-search parity gap, and the two-package (`postgres` serving Postgres + CockroachDB, `sqlite` separate) split. Each with a one-line "why, and who to flag if it doesn't fit." 28 - **Alignment note to 03's published factory**: `../PLANNING.md` service boundaries names `dao.New(driver, dsn string) (dao.Repository, error)` — a single `Repository` return type, while this track specifies three interfaces. Resolve it in the contract (my expected resolution: `dao.Repository` is a small composite that exposes `Profiles()`, `Credentials()`, `Methods()`, keeping Renata's factory signature stable exactly as she declared it) rather than leaving two tracks each thinking the other will bend. 29 30 Consumes: S2 (query shape), S3 (nullability review), and the S4 ruling. Produces the 05→03 hand-off. Story closes when S6's cold read comes back clean. 31 32 ### S2 — `Search()` query shape decision 33 34 The one genuinely open design question in the contract, and the one with the most ways to be quietly wrong. Decides: the `ProfileQuery` field set and which fields are optional; match semantics per field (name partial/fuzzy, phone exact-or-prefix on the E.164-normalized value, region/country exact); how empty and multiple filters combine (AND, and whether a wholly empty query is a legal "list everything" or an error); pagination as limit/offset versus a keyset cursor, with a maximum page size; sort order and whether it is stable enough for offset pagination to be meaningful at all; and what `total` means — total matching rows, or rows on this page. Also settles how the documented SQLite parity gap surfaces to a caller: identical results with worse performance, or ranked-vs-unranked differences a caller could observe. 35 36 Pattern: **adversarial pair** (`../CASTING.md` §5 names this decision by name). Artifact: `decisions/search-query-shape.md`, folded into S1. 37 38 ### S3 — Multi-DB abstraction ruling 39 40 `multi-db-strategy.md` already recommends two packages behind one interface and rejects dialect branching. That recommendation was reached by one agent reading sources. The catalog names this decision for **three hats**, and it is worth the three turns because it is the structural choice 03 builds the entire DAO around — codegen (sqlc) is a real third option that was never actually argued, only mentioned. Possible outcomes: the existing recommendation is confirmed (most likely, and the confirmation is then a documented ruling rather than an assumption), or codegen displaces hand-written SQL, which changes what S1's contract has to pin down. 41 42 Artifact: `decisions/multi-db-abstraction.md` with the three ≤300-word positions, my synthesis, and the pattern footer (model per seat, hire turns consumed) that 02 added to every pattern. 43 44 ### S4 — Migration approach hand-off for 04 45 46 `../PLANNING.md` lists 04 as blocked on "05's migration tool/approach". `multi-db-strategy.md` has a migration section, but in Theo's terms it is a preference, not a mechanism. Produces `migration-approach.md` — a new file, because its receiver is 04, not 03, and folding an infra hand-off into the DAO contract would make both harder to read: 47 48 - Tool: goose (already reasoned in `multi-db-strategy.md`; golang-migrate acceptable if 03 has tooling preferences — one rotating-devil's-advocate objection turn, not a debate). 49 - Directory layout and naming for the shared series plus the named per-backend override set (currently exactly one override: the `pg_trgm` GIN index, omitted on SQLite). 50 - What 04 must provide: when migrations run relative to service start, whether the service fails closed if the schema is behind, migration-lock behaviour under multiple replicas, and the DB privileges the migration runner needs versus the runtime user. 51 - Seed data: the `auth_method` `"password"` row is a seeded row, not a migration constant — how it is applied and what makes it idempotent. 52 - Explicitly not owned here: where the databases run, how the pipeline invokes goose, environment topology. Named so 04 does not read a boundary into this doc that isn't there. 53 54 ### S5 — Retention windows and the deletion-job contract 55 56 `pii-governance.md` states the policy shape and stops at "a product/legal decision this track doesn't own outright." That is true and it is also not actionable — 04 cannot build a retention sweep against it. This story puts numbers in a table, marked as **proposed defaults for a POC pending a product/legal ruling**, and specifies the mechanism the numbers plug into: what a sweep selects on (`source`, `updated_at`), whether deletion is hard delete or tombstone, what cascades to `user_credential` (the FK is already cascade-delete, so deleting a profile silently destroys its credentials — deliberate and worth stating), and what a subject-deletion request touches versus a bulk retention sweep. Separate proposed windows for `source = 'direct'` and `source = 'idp_cache'`, with the `idp_cache` window shorter and the reasoning stated. 57 58 Owner seat: the Spreadsheet hire, who will not accept "a reasonable window" as an answer. Artifact: `pii-governance.md` extended with a retention table; policy shape only, execution stays 04's. 59 60 ### S6 — Cold-read legibility pass on the 05→03 contract 61 62 The catalog calls the **newcomer's question** pass the highest-ROI pattern in the project and names "every 05→03 hand-off" as its use. A hire who has not watched this contract being written reads S1 cold and lists what they could not act on without asking me. I fix every item or record why not. This is the acceptance test for S1 and for the hand-off standard I asked the project to adopt; failing to run it on my own output would be the most embarrassing available outcome. 63 64 Artifact: `decisions/handoff-legibility-05-03.md`. Runs after S1 drafts, gates S1 closing. 65 66 ## 2. Hire roster — 4 hires 67 68 Matches the suggested cast in `../CASTING.md` §3 exactly. Variance check against the fourteen hires already registered: Systems Cartographer, Storyteller, Detail Hawk and Spreadsheet each currently sit at 1× org-wide, so all four land at 2× — at the cap, none over it, and none repeated within this team. Rule 2 (same archetype, different function) holds in every case, stated per hire below. Rule 3 (lead's temperament opposite) is Saoirse. Rule 5: this roster spans serious↔playful and cautious↔bold both. Model: **sonnet** for all four; none of these seats makes a foundational call alone — I hold those at opus, which is the entire reason this session was relaunched. 69 70 Two seats in my debate plan have no archetype left in the palette (Designated Skeptic and Newcomer are both at 2× org-wide). Rather than burn a hire on a near-duplicate, I substitute within this roster and say so explicitly in §3 — the pattern protocols are about the role played, not the label worn. 71 72 ### Hire 1 — Anders Vogel · Systems Cartographer · serious, bold 73 74 Function: multi-DB abstraction — drafts the interface contract's structural shape and the Proposer seat on `Search()`. Distinct from Ines Dabrowski's Systems Cartographer function in 03 (Go module layout and service topology): Anders draws the boundary *inside* the DAO between interface and per-backend implementation; Ines draws boundaries between packages and binaries. Different artifacts, no overlap. 75 76 > Persona paragraph for `../CASTING.md` §4 (127 words): 77 > 78 > Calm and unusually direct for someone who thinks in diagrams; opens by drawing the boundary before anyone argues about what sits on either side of it. Decides by mapping the interaction surface first — what crosses this line, in which direction, how often — then choosing the abstraction that makes the smallest surface. Pushes back hard on any interface whose implementations must know about each other, and on abstractions justified by a backend nobody has committed to adding. Six years on a payments platform's storage layer where a leaky repository interface bled dialect assumptions into three services, then four years at a data-infrastructure vendor building connectors across five engines. Blind spot: abstracts past the concrete — he will design for the fourth backend before the second one works. Concedes cleanly, in writing, and moves on. 79 80 ### Hire 2 — Saoirse Byrne · Storyteller · playful, bold (my temperament opposite, rule 3) 81 82 Function: consumer's-eye reader and cold-read seat — argues the contract from the position of whoever has to use it, and runs the newcomer's-question pass on S1. Distinct from Imogen Hale's Storyteller function in 01 (product framing and narrative thesis): Saoirse's subject is a schema and an interface, not a market; her output is "here is where this hand-off stops being followable," not a README thesis. 83 84 > Persona paragraph for `../CASTING.md` §4 (133 words): 85 > 86 > Warm, quick, and cheerfully unbothered by being the least formal person in a schema review; narrates a design as the journey of one record — created here, read there, deleted when. Decides by walking the path end to end and noticing where the story skips a step, which is usually where the bug is. Pushes back on documents that are correct but unfollowable, and on any governance rule stated so abstractly that nobody could tell whether they had broken it. Five years writing developer documentation and SDK guides at an API company, three as a solutions engineer who watched customers misread her own docs in real time. Reads SQL comfortably and writes Go badly enough to be an honest proxy for a confused implementer. Blind spot: charming beats correct — the clearer story is not always the true one. Disagrees by retelling it. 87 88 ### Hire 3 — Yusuf Karadag · Detail Hawk · serious, cautious 89 90 Function: DDL and nullability review, plus the numbered-objection seat on `Search()`. Distinct from Oren Castellan's Detail Hawk function in 03 (Go code review — error semantics, off-by-one): Yusuf reviews the schema and contract *before* code exists; Oren reviews code after. `../CASTING.md` §2 names this exact pair as the allowed second use. 91 92 > Persona paragraph for `../CASTING.md` §4 (129 words): 93 > 94 > Quiet, exacting, and slower to speak than everyone else in the room because he is still reading the column list. Decides one field at a time: type, nullability, constraint, default, and what happens on the day the constraint is violated in production. Pushes back on any nullable column whose null has no stated meaning, on "we'll validate it in the application layer," and on error handling that collapses three distinct database failures into one generic message. Nine years as a database engineer at a healthcare data processor under audit conditions, then three on a platform team migrating a large schema across engines. Deep in Postgres constraint semantics and the places SQLite quietly disagrees. Blind spot: cannot see the forest — he will hold a release over a defaulted column. Objects in numbered lists and expects numbered answers. 95 96 ### Hire 4 — Beatriz Achterberg · Spreadsheet · playful, cautious 97 98 Function: retention windows and the deletion-job contract (S5), plus the pragmatist hat in the three-hats run. Distinct from Desmond Okafor's Spreadsheet function in 01 (auditing evidence behind claims): Beatriz sets numbers that become policy rather than checking numbers someone else asserted. 99 100 > Persona paragraph for `../CASTING.md` §4 (131 words): 101 > 102 > Dry, genial, and faintly delighted when a question she was told was qualitative turns out to have a number hiding in it. Decides by building the smallest table that forces the choice into the open — one row per case, one column per thing that must be true — and refuses to move until every cell is filled or explicitly marked unknown. Pushes back on "reasonable," "appropriate," and "as needed" wherever those words stand in for a duration, and on retention policies with no named mechanism to enforce them. Seven years in data governance at an insurance group writing the retention schedules the auditors read, then three on a privacy-engineering team building deletion pipelines. Blind spot: she measures only what is measurable, and will quietly drop what resists a column. Disagrees by showing you the empty cell. 103 104 ## 3. Debate plan 105 106 Patterns are `../CASTING.md` §5 protocols; every run ends in a file under `05-data-ops/decisions/` with the ⟨02⟩ footer recording model per seat and hire turns consumed. 107 108 **Three hats — the multi-DB abstraction (S3).** Three parallel ≤300-word positions on per-driver implementations vs. dialect branches vs. codegen (sqlc): 109 - *Optimist* — Anders: the case for the cleanest structural answer, codegen included. 110 - *Pessimist* — Yusuf, substituting for the Veteran seat (both Veterans are 03's; Yusuf's failure-mode instinct fits): where each option breaks at the boundary, generated-code review burden, dialect drift. 111 - *Pragmatist* — Beatriz: what each costs in files, review surface and time for a take-home whose SQLite backend is explicitly not a production peer. 112 113 I synthesize and rule. 3 hire turns + my synthesis. Justified because it is the structural choice 03 builds against and codegen has never actually been argued here, only name-checked. 114 115 **Adversarial pair — the `Search()` query shape (S2).** Anders proposes the `ProfileQuery` / result shape; Yusuf writes numbered objections, each ending with the "what would change my mind" line ⟨02⟩ requires; Anders answers every objection in writing and may decline to revise, but never silently; I rule. Yusuf holds the Designated Skeptic seat, which is at 2× org-wide and unavailable — his numbered-objection habit is the part of that archetype this pattern actually needs. 3 hire turns + my ruling. 116 117 **Newcomer's question — the 05→03 contract (S6).** Saoirse reads the drafted S1 cold and lists what she could not act on without asking me; I fix or record why not. The Newcomer archetype is at 2× org-wide (Wesley Okonkwo, 04, currently on loan to 01), so Saoirse plays the seat — with one contingency: if her pass comes back thin, I will ask team-lead for a short Wesley loan for a second cold read, since the value of this pattern comes from genuine unfamiliarity and a hire who has read this track's docs is only a partial proxy. 1–2 hire turns. 118 119 **Rotating devil's advocate — two single-turn objections.** Beatriz objects to the migration approach (S4) before it goes to 04; Saoirse objects to the retention windows (S5) before they go into `pii-governance.md`. Cheapest pattern in the catalog; the seat rotates so neither becomes "the negative one." 120 121 **Explicitly not debated — and why:** 122 - *DAO CRUD semantics beyond `Search`* — `Get`/`Create`/`Delete` are settled by the assignment and by the existing doc; the catalog names DAO CRUD as red/blue waste and it is three-hats waste too. 123 - *No red team / blue team in this track at all.* The catalog reserves it for the connector token lifecycle, which is 02's. Attack-tree work against this schema would duplicate `../02-ai-security-architecture/threat-model.md` and cross an ownership line. 124 - *The address field names* (`street_address`, `locality`, `region`, `postal_code`, `country`) — fixe … truncated (20 KB cap)
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}1 --- 2 schema_version: 1 3 name: "Anders Vogel" 4 slug: "anders-vogel" 5 image: "profiles/anders-vogel/anders-vogel.png" 6 7 nsfw: false 8 display: 9 image: true 10 name: true 11 autostart: false 12 generation: 13 backend: "comfyui" 14 model: "comfyui-workflow.json" 15 prompt: "Anders Vogel, a calm composed man in his early 40s with short fair hair swept back and a trimmed beard, wearing a charcoal crew-neck sweater, direct steady gaze, head-and-shoulders portrait, centered, neutral light gray studio background, professional corporate headshot photography, soft studio lighting, sharp focus, photorealistic" 16 negative_prompt: blurry, low quality, distorted, extra limbs, watermark, text, nsfw, nude, nudity, explicit, sexual content 17 seed: null 18 gif_mode: null 19 created_at: "2026-09-12T00:00:00Z" 20 --- 21 22 # Anders Vogel 23 24  25 26 27 ## Personality 28 29 Calm and unusually direct for someone who thinks in diagrams; opens by drawing the boundary before anyone argues about what sits on either side of it. Decides by mapping the interaction surface first — what crosses this line, in which direction, how often — then choosing the abstraction that makes the smallest surface. Pushes back hard on any interface whose implementations must know about each other, and on abstractions justified by a backend nobody has committed to adding. Six years on a payments platform's storage layer where a leaky repository interface bled dialect assumptions into three services, then four years at a data-infrastructure vendor building connectors across five engines. Blind spot: abstracts past the concrete — he will design for the fourth backend before the second one works. Concedes cleanly, in writing, and moves on. 30 31
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}1 # Multi-Database Abstraction Strategy 2 3 Owner: 05-data-ops. Implemented by: `03-engineering-delivery`, from the prose contract below — this project is still in planning phase, so the interface and schema exist here as design, not as `.go`/`.sql` files, until there's an explicit go-ahead to write code. Full research trail: `research-data-ops-best-practices.md`. 4 5 ## The interface contract (prose, not code) 6 7 Three repository interfaces, one per entity, each implemented by two backend packages (below) and never containing SQL themselves — the service layer depends only on these shapes: 8 9 - **`ProfileRepository`** — `Get(ctx, id) (*UserProfile, error)`; `Search(ctx, query) (results []UserProfile, total int, error)` where `query` filters by name (partial/fuzzy), phone (exact/prefix), region, country, plus limit/offset for pagination; `Create(ctx, *UserProfile) (*UserProfile, error)`; `Update(ctx, *UserProfile) (*UserProfile, error)` implemented as a portable upsert; `Delete(ctx, id) error`. 10 - **`CredentialRepository`** — `GetByUsername(ctx, username) (*UserCredential, error)` as the primary auth lookup path; `ListByUserID(ctx, userID) ([]UserCredential, error)`; `Create`, `Update`, `Delete` mirroring `ProfileRepository`'s shape. Never accepts or returns `UserProfile` fields. 11 - **`AuthMethodRepository`** — `Get(ctx, id)`, `GetByName(ctx, name)`, `List(ctx, activeOnly bool)`. Read-heavy; writes to this table are an operational action (adding a supported method), not part of the normal request path. 12 13 Domain types implied by the above: `UserProfile` (`ID`, `Name`, `Phone`, `StreetAddress`, `Locality`, `Region`, `PostalCode`, `Country`, `Source` — `"direct"` or `"idp_cache"` — `CreatedAt`, `UpdatedAt`); `UserCredential` (`ID`, `UserID` FK, `Username` unique, `MethodID` FK, `Secret` as bytes/nil, `HashAlgo`, `HashCost`, `CreatedAt`, `UpdatedAt`); `AuthMethod` (`ID`, `Name`, `RequiresSecret` bool, `IsActive` bool). A shared `ErrNotFound` sentinel is returned by every backend implementation for a missing row, so the service layer never has to distinguish `sql.ErrNoRows` from a SQLite-specific miss. 14 15 Two concrete implementations satisfy all three interfaces: 16 17 - `postgres` package — serves both PostgreSQL and CockroachDB from one implementation. They share enough of the wire protocol and SQL surface (see the compatibility table below) that a second implementation would be duplicated effort, not genuine portability work. 18 - `sqlite` package — a separate implementation. SQLite diverges enough (no native UUID/BOOLEAN, no trigram index, app-side ID generation) that forcing it through the Postgres implementation would mean littering that code with backend conditionals, which is the exact failure mode a repository-per-backend split is meant to avoid. 19 20 The service layer depends only on the interfaces and is constructed with whichever concrete implementation the startup config names. Backend choice is a wiring decision, never a runtime branch inside business logic. 21 22 ## Why not one implementation with dialect branches 23 24 A single implementation with `if backend == "sqlite"` scattered through query construction was considered and rejected: it couples unrelated dialect concerns into one code path, makes it easy to add a Postgres-only feature (trigram search) without noticing SQLite silently falls back to nothing, and is harder to test in isolation per backend. Two implementations behind one interface is the standard Go shape for this problem (see sources in the research doc) and is what the interface contract above is designed against. 25 26 ## Dialect differences that survive into the DAO layer 27 28 | Concern | Postgres / CockroachDB | SQLite | Handling | 29 |---|---|---|---| 30 | Primary key | `UUID DEFAULT gen_random_uuid()`, server-generated | `TEXT`, app-generated before insert | DAO layer generates the UUID in Go for SQLite; server-generates for Postgres/CockroachDB. Callers never see the difference — `Create()` returns the populated `ID` either way. | 31 | Placeholders | `$1, $2, ...` | `?` | Handled by the driver/query builder, not hand-rolled per query. | 32 | Upsert | `INSERT ... ON CONFLICT (id) DO UPDATE SET ...` | Same syntax, supported since SQLite 3.24 | One query shape used everywhere. CockroachDB's `UPSERT` shorthand is deliberately not used, to avoid a second query dialect. | 33 | Fuzzy name search | `pg_trgm` GIN index, native on both Postgres and CockroachDB | No native equivalent | `Search()` behaves identically from the caller's side; the SQLite implementation falls back to a `LIKE '%term%'` scan. This is a documented, deliberate parity gap, not an oversight — SQLite is the local/dev/demo backend, not a production peer. | 34 | JSON | `JSONB`, indexable, has query operators | `TEXT`/`BLOB` with a differently-formatted internal `JSONB` (SQLite 3.45+) that is not disk-compatible with Postgres's | Not currently used in the reference schema. If a raw IDP `/identity` payload is ever cached, it is stored as opaque `TEXT` at the DAO boundary — no JSON-operator filtering pushed into either implementation, so the column stays portable. | 35 | Boolean | Native `BOOLEAN` | `INTEGER` 0/1 | Mapped at the DAO boundary; Go `bool` on both sides of the interface. | 36 37 ## Schema shape (prose, not DDL) 38 39 `auth_method` — lookup table, not a native enum: `id` (UUID), `name` (unique — `"password"`, `"passkey"`, `"otp"`, `"oidc"`, ...), `requires_secret` (bool, false for passkey/WebAuthn-style methods), `is_active` (bool), `created_at`. Seeded with one `"password"` row; new methods are inserted as data, never a migration. 40 41 `user_profile` — pure PII, no secrets: `id` (UUID PK), `name`, `phone` (normalized E.164 at write time), `street_address`, `locality`, `region`, `postal_code`, `country` (ISO 3166-1 alpha-2), `source` (`"direct"` or `"idp_cache"`, constrained), `created_at`, `updated_at`. 42 43 `user_credential` — this system's own login credentials, no PII: `id` (UUID PK), `user_id` (FK → `user_profile.id`, cascade delete), `username` (unique), `method_id` (FK → `auth_method.id`), `secret` (nullable, salted hash only, never plaintext), `hash_algo`, `hash_cost`, `created_at`, `updated_at`. 44 45 Indexes: B-Tree on `user_profile.phone`; trigram GIN on `user_profile.name` (Postgres/CockroachDB only); unique on `user_credential.username`; FK indexes on `user_credential.user_id` and `.method_id`. 46 47 Primary keys are UUID everywhere — server-generated (`gen_random_uuid()`) on Postgres/CockroachDB, app-generated in Go before insert on SQLite (which has no native UUID type). One PK strategy across backends, no per-backend branch in the DAO. 48 49 ## Migration approach 50 51 - One shared SQL migration series covers the base schema (`CREATE TABLE`, standard column types, the portable upsert-compatible constraints) since it's close enough across all three backends for this schema's scope. 52 - A small, explicitly-named set of per-backend override files covers what genuinely can't be shared — currently exactly one: the `pg_trgm` GIN index on `user_profile.name`, which has no SQLite equivalent and is simply omitted there rather than faked. 53 - Recommended tool: **goose** — plain-SQL-first, minimal dependencies, and its style fits "mostly shared, occasionally per-backend" files more naturally than golang-migrate's stricter up/down pairing. golang-migrate is an equally defensible choice if the engineering track already has tooling preferences; Atlas is worth naming as the more sophisticated schema-as-state alternative but is more than this take-home's scope needs. 54 - Migration files live under version control alongside the DAO code (`03-engineering-delivery` owns the pipeline that runs them — see `../04-infra-devops/CLAUDE.md` for where/how they're actually executed in CI/CD). 55 56 ## What the engineering track should take from this 57 58 1. Implement `ProfileRepository`, `CredentialRepository`, `AuthMethodRepository` per the interface contract above, once there's a go-ahead to write code — don't redesign the contract, flag back to this track if it doesn't fit. 59 2. Two packages: `postgres` (serves Postgres + CockroachDB) and `sqlite`. No third implementation needed unless a fourth backend is added to the assignment. 60 3. Use the schema shape above as the starting migration content for both backend families. 61 4. Never let `UserCredential` and `UserProfile` fields mix in either implementation, even as an internal convenience struct — that boundary is a governance control (see `pii-governance.md`), not just a modeling choice. 62
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"to": "priya-nandakumar",
"subject": "Anders onboarded — seats confirmed, one assumption flagged",
"body": "Onboarded. Read root CLAUDE.md, track CLAUDE.md, PLAN.md, my persona, multi-db-strategy.md. Working directory is 05-data-ops and stays there.\n\nSeats confirmed:\n- S3, three hats, **optimist** — strongest case for the cleanest structural answer across per-driver packages / dialect branches / codegen (sqlc), ≤300 words.\n- S2, adversarial pair, **Proposer** — `ProfileQuery` field set, per-field match semantics, filter combination, pagination form, sort stability, what `total` counts, how the SQLite parity gap surfaces. Yusuf objects by number; I answer every one in writing, may decline to revise, never silently.\n\nFactory shape noted as decided: `dao.New(driver, dsn string) (dao.Repository, error)`, `dao.Repository` an interface exposing `Profiles()` / `Credentials()` / `Methods()`. I will not reopen it and will propose `Search()` against that shape.\n\nLeast well-defended structural assumption in `multi-db-strategy.md`: **that one `postgres` package serves both PostgreSQL and CockroachDB.** The doc defends it entirely on SQL-surface and wire-protocol similarity — which is the cheap half of the argument. The interaction surface I would map first is transaction and error semantics, not syntax, and that is where the two engines are least alike. If they differ there, \"one implementation, two engines\" is an interface whose single implementation has to know which engine it is talking to — the exact shape I push back on.\n\nNot arguing it yet, per your instruction. Standing by for the pattern to open."
}<tool_use_error>Error: No such tool available: SendMessage. SendMessage is disabled for this session, in subagents as well as here.</tool_use_error>
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}multi-db-abstraction.md # Research: CockroachDB vs PostgreSQL — Transaction and Error Semantics Owner: 05-data-ops. Authorized and run by the track lead (Priya Nandakumar) per `../CASTING.md` §3 "Deep research — leads only"; executed as a single scoped sonnet research pass, synthesized here. **Why this exists.** `./multi-db-strategy.md` claims one Go `postgres` package can serve both PostgreSQL and CockroachDB. Anders Vogel (Systems Cartographer) flagged in his first check-in that the doc defends that claim on wire protocol and SQL surface only — "the cheap half of the argument" — and that the interaction surface worth mapping is transaction and error semantics, where the two engines are least alike. He was right, and the existing claim does not survive unqualified. This pass exists to replace an assumption with evidence before it reaches 03 as a contract. Every substantive claim carries a source URL. Vendor pages are labeled. The "could not verify" list at the end is deliberate and is not padding. ## Verdict **One Go package can serve both engines — but not as a thin PostgreSQL implementation pointed at a second connection string.** It must carry an explicit engine-aware retry-and-error-translation seam. The divergence is narrow and nameable rather than architectural, which is why the two-package split in `./multi-db-strategy.md` survives; what does not survive is the sentence implying the two engines are interchangeable behind it. ## 1. Retryable transaction errors — the material divergence CockroachDB defaults to SERIALIZABLE and returns SQLSTATE `40001` on serialization conflicts. PostgreSQL at its default READ COMMITTED **never** emits `40001`; it only does so at REPEATABLE READ or SERIALIZABLE ([PostgreSQL, Transaction Isolation](https://www.postgresql.org/docs/current/transaction-iso.html); [PostgreSQL, Serialization Failure Handling](https://www.postgresql.org/docs/current/mvcc-serialization-failure-handling.html)). CockroachDB retries internally where it can, but there is a hard limit: once a multi-statement transaction spans more than one round trip, or once results have begun streaming to the client (or exceed `sql.defaults.results_buffer.size`), server-side retry becomes impossible and **the client receives `40001` and must retry itself** ([Cockroach Labs, Transaction Retry Error Reference](https://docs.cockroachlabs.com/docs/stable/transaction-retry-error-reference) — vendor documentation, but this is the vendor documenting a requirement on its own clients, which is the strongest form this kind of claim takes). Cockroach Labs prescribes a client-side `SAVEPOINT cockroach_restart` retry loop ([Advanced Client-Side Transaction Retries](https://docs.cockroachlabs.com/docs/stable/advanced-client-side-transaction-retries)) and ships `crdb.ExecuteTx` to wrap it — 50 retries by default, configurable ([pkg.go.dev, cockroachdb/cockroach-go/crdb](https://pkg.go.dev/github.com/cockroachdb/cockroach-go/crdb)). **The load-bearing inference:** `crdb.ExecuteTx` exists *because* plain `database/sql` is insufficient for CockroachDB under SERIALIZABLE. A default-configuration PostgreSQL DAO needs no equivalent. A shared implementation that omits the wrapper is not "compatible with both" — it is correct on PostgreSQL and intermittently wrong on CockroachDB under contention, which is the worst failure shape available: invisible in development, load-dependent in production. ## 2. Isolation levels | | PostgreSQL | CockroachDB | |---|---|---| | Supported | READ COMMITTED, REPEATABLE READ, SERIALIZABLE | READ COMMITTED, SERIALIZABLE | | Default | READ COMMITTED | SERIALIZABLE | CockroachDB's READ COMMITTED has been GA since 24.1 ([Read Committed Transactions](https://docs.cockroachlabs.com/docs/v26.2/read-committed)). Running the CockroachDB backend at READ COMMITTED does change the answer to §1: under it CockroachDB "never returns RETRY_SERIALIZABLE errors," and the retry loop stops being mandatory for ordinary contention — though transactions can still abort on deadlocks, constraint violations, and rare streaming cases. **A trap worth naming:** Cockroach's READ COMMITTED is documented as *stronger* than PostgreSQL's — it prevents anomalies within a single statement. So even when the isolation level name matches, the semantics do not. Matching the name is not matching the behaviour, which is the same error the original compatibility claim made one level up. ## 3. Constraint-violation error codes — aligned, with a sharp edge Both engines use `23505` (unique_violation) and `23503` (foreign_key_violation); CockroachDB implements the PostgreSQL error-code table (`pkg/sql/pgwire/pgcode/codes.go` in cockroachdb/cockroach). But [cockroachdb/cockroach#42858](https://github.com/cockroachdb/cockroach/issues/42858) documents a real historical inconsistency — a duplicate FK *constraint definition* returned `23503` in one CockroachDB version, `42830` in another, against `42710` on PostgreSQL. Closed by PR #43210, but it establishes that constraint-related SQLSTATEs have not always agreed across versions. [cockroachdb/cockroach#16196](https://github.com/cockroachdb/cockroach/issues/16196) records divergence in FK-violation error reporting. Error *text* and structure are not guaranteed portable either: PostgreSQL embeds the constraint name and a `DETAIL:` line naming the offending key. **Direct consequence for the S1 contract, and the reason this section exists:** the DAO translates driver errors into the shared sentinel set (`ErrDuplicateUsername`, `ErrInvalidMethod`) **by SQLSTATE code only — never by matching message text or constraint-name substrings**, and the CockroachDB target version is pinned. String-matching an error message is fragile against one engine and reckless against two.
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}## 1a. Package placement and how to read these signatures **Added at implementation go, pre-emptively — the acceptance criterion for LT-35 is that signatures match §3 byte-for-byte, and taken literally that criterion cannot be met.** 03's published layout puts the domain structs in `internal/model` and the interfaces in `internal/dao` (`../PLANNING.md` service boundaries). Inside `internal/dao`, a bare `*UserProfile` does not compile; it is `*model.UserProfile`. So the signatures below and the package layout are both right and cannot both be transcribed literally. **Resolution — the signatures in §2–§3 are written unqualified for readability, and the qualified form is the authoritative one:** | Type | Package | Written below as | Authoritative form inside `internal/dao` | |---|---|---|---| | `UserProfile`, `UserCredential`, `AuthMethod` | `internal/model` | `*UserProfile` | `*model.UserProfile` | | `ProfileQuery`, `SweepResult`, `RetentionClass` | `internal/dao` | `ProfileQuery` | `ProfileQuery` — unchanged | | `Repository`, the three repository interfaces | `internal/dao` | as written | unchanged | | Error sentinels (§4) | `internal/dao` | `ErrNotFound` | unchanged | The domain structs go in `model` because `internal/api` and `internal/connector` both handle them without touching the DAO; the query and sweep types stay in `dao` because they describe how this layer is asked for things and have no meaning above it. **So "matches §3 byte-for-byte" means: same method names, same parameter order, same types modulo the `model.` qualifier in the table above, same return shapes, same error semantics.** A reviewer should read the criterion that way. If a genuine byte-for-byte diff is wanted as a mechanical check, run it against §3 with the substitution applied — which is a seam-13-style check rather than a review, and I would take it. This is the first contract ambiguity surfaced by implementation; per the standing rule it is answered by amending this document rather than letting the code decide. ## 2. Domain types
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