DB Olympics

Queries · q323 · Data Protection Officer · week 2, night 1

Privacy request volume reconciliation: counts by type and status

“What is the defensible, auditable count of privacy (DSAR) requests by type and status, so we can reconcile against the ~48 figure quoted elsewhere and the 60 we found last week before briefing the regulator?”

Manager · asked the questionInes LaurentData Protection Officer. Lawyer by training, previously at a European marketplace. Also reports to the board's audit committee.
Analyst · planned the reportPriyanka DesaiAuditor's mindset: traces individual records end to end to check that the totals are real.
Engineer · wrote the SQLFelixJunior engineer who nests subqueries in FROM and WHERE (IN, EXISTS, correlated subqueries) rather than CTEs.

Fictional people at a fictional company, each played by a language-model agent. Who they are and what they are told

  1. A business event lands on the Data Protection Officer's desk

    Week 2; shared with Henrik Aalto, Chief Information Security Officer

    A data protection authority asked how we handle privacy: how many privacy requests we receive and how fast we complete them, how consent is recorded, and what remains after an account is deleted.

  2. Ines Laurent writes to Priyanka Desai

    The manager, at the start of week 2

    Subject: Week 2 — DPA inquiry changes our priorities

    Priyanka,

    Good work — this is exactly the kind of digging I wanted. A few things surprised me and now matter more because of the regulator inquiry (which I'm handling jointly with Henrik Aalto, CISO — our response needs to be accurate and defensible, not just reassuring).

    What struck me:

    • The three "open" erasure requests aren't really open, they're parked behind legal holds — but we don't actually know if those holds are still justified. If a regulator asked us today why those erasures haven't happened, "disputes" that are 1.5–2.6 years old is not a comfortable answer without evidence.
    • We have a closure-tracking gap (rejected requests never get a completion date) and apparently zero portability requests in three years. Both could be true, or both could be an artifact of how we log things — and I don't want to hand the regulator a number I can't stand behind.
    • The email retention failure is concrete and fixable, but it also means I can't yet answer "what remains after an account is deleted" with confidence for other categories until we know how widespread this is.
    • The consent anomaly (one category showing suspiciously perfect opt-in) undermines my confidence in saying "this is how consent is recorded" to a regulator until it's explained.

    So, for this week, please prioritize work that lets us answer the DPA's three questions honestly: volume and speed of privacy requests, how consent is captured and whether it's reliable, and what data persists post-deletion. That's the deliverable Henrik and I need to brief the board audit committee before we respond.

    My questions:

    1. For the three long-running legal holds, can we establish — from whatever evidence exists — whether the underlying disputes are still active, so I can decide whether to push for release or document why they must stand?
    2. Can we get a trustworthy, defensible count of privacy requests received and resolved, including the rejected ones and whether "zero portability requests ever" is real or a logging blind spot — the regulator will ask for exactly this?
    3. How confident can we be in what consent records actually show, given the anomaly you flagged — do we have other categories with the same too-clean pattern, and does that change how I'd describe our consent process to a regulator?
    4. Beyond email, how much shopper data elsewhere is sitting past its stated retention window right now — I need a true current picture of "what remains after deletion," not just the one confirmed violation.

    If all four can't fit, start with 2 and 4 — those go directly into the regulator response.

    Thanks, Ines

    A note from the Chief Information Security Officer, Henrik Aalto

    Subject: Security angle for the DPA response

    Hi Priyanka,

    A few things from my side that would strengthen the privacy response:

    1. When a data subject request results in erasure, can we show what login/session and access history remains afterward, and for how long — i.e. do our retention rules actually clear it out, or does it linger?
    2. For consent withdrawals, do we have any evidence that we stop using/collecting the related data promptly (e.g. no further sign-ins or sensitive-data access tied to that account after withdrawal)?
    3. On the completion-time question the DPA is asking about — can we also show whether requests touching account security data (sessions, API/service credentials, access logs) take longer to close than others? That's often where delays hide.

    Happy to compare notes before you send anything to data engineering.

    Henrik

  3. Priyanka Desai plans the night

    The analyst · week 2, night 1, request 1 of 3

    Ines said to lead with priorities 2 and 4 if slots are tight, so tonight is entirely those two. For priority 2, I'm not just re-stating last week's 60-request total — Claire Dubois (Risk & Payments) posted ~48 requests company-wide in the same channel, which doesn't match my count, so before anything goes to the regulator I need an auditable type-x-status breakdown that either reconciles the two numbers or pinpoints exactly where they diverge. I'm also treating "zero portability requests ever" as a hypothesis to test rather than a fact: since data_subject_requests.data_export_id links to data_exports, I can check whether export jobs are actually being run for shoppers outside the formal DSAR table — if so, that's a logging blind spot, not a true zero. For priority 4, last week I only checked 2 of the 6 policy-covered tables (email_log confirmed broken, audit_log mostly fine with a narrow gap); tonight I'm closing out the remaining four (events, job_runs, page_views, system_health_checks) at a compact one-row-per-table grain so Ines has the full current picture of "what persists past its stated window," not just the one confirmed violation. I'm deferring the legal-hold evidence question (priority 1), the consent anomaly (priority 3), and Henrik's three asks to night 2, since those need either external evidence (disputes) or more design thought (what "touches security data" means for a request) that I don't want to rush tonight.

    Privacy request volume reconciliation: counts by type and status
    Question
    What is the defensible, auditable count of privacy (DSAR) requests by type and status, so we can reconcile against the ~48 figure quoted elsewhere and the 60 we found last week before briefing the regulator?
    One row per
    (request_type, status) combination, across full history, all tenants
    Columns
    • request_type
    • status
    • count
    • earliest received_at (date)
    • latest received_at (date)
    • median days to close (completed_at minus received_at, in days, for rows where completed_at is not null; blank if none)
  4. Felix writes the SQL

    The engineer · 1 dry run on the empty schema, then the submission

    Dry run 1 · STATUS: COMPILES (dry run on the empty schema, no data read)
    SELECT
      request_type,
      status,
      count(*) AS request_count,
      min(received_at)::date AS earliest_received_at,
      max(received_at)::date AS latest_received_at,
      round(
        percentile_cont(0.5) WITHIN GROUP (
          ORDER BY extract(epoch FROM (completed_at - received_at)) / 86400.0
        ) FILTER (WHERE completed_at IS NOT NULL),
        1
      ) AS median_days_to_close
    FROM data_subject_requests
    GROUP BY request_type, status
    ORDER BY request_type, status

    “Query compiles cleanly with the right columns. Submitting now.”

    Submitted · the SQL of the last dry run, unchanged · Submitted to tonight's batch. Your work on this request is done.

    “Submitted. The report groups data_subject_requests by (request_type, status) exactly as stored, with count, earliest/latest received_at, and median days-to-close (NULL where no rows have completed_at) — full history, no tenant filter, ordered by type then status so Priyanka can trace how the ~48 and ~60 figures reconcile against the ground truth.”

  5. The report comes back overnight

    As Priyanka Desai saw it, from the small dataset the agents worked on

    request_type  | status      | request_count | earliest_received_at | latest_received_at | median_days_to_close
    --------------+-------------+---------------+----------------------+--------------------+---------------------
    access        | completed   |            11 | 2022-08-25           | 2025-09-01         |                  5.8
    access        | in_progress |             1 | 2025-12-29           | 2025-12-29         |                 NULL
    erasure       | completed   |            39 | 2020-04-24           | 2025-10-18         |                  8.1
    erasure       | received    |             1 | 2025-12-06           | 2025-12-06         |                 NULL
    erasure       | rejected    |             3 | 2023-05-26           | 2025-03-21         |                 NULL
    rectification | completed   |             5 | 2021-09-23           | 2024-06-26         |                 13.9
    (6 rows)
  6. What came of it

    The memo and the queries that followed; links found by title, so inferred

    Later queries that build on this report:

    It builds on:

  7. It becomes benchmark query q323

    Changed only where the benchmark needs the same result on every system

    • spellingcast (2×)
    • numericsdocs/NUMERICS.md: rounding removed; results keep full precision
    • numericsdocs/NUMERICS.md: EXTRACT(EPOCH FROM (b - a)) cast to NUMERIC(18,6)
    • placeholderpercentile cont
    • placeholderseconds between
    • determinismthe standard leaves the place of NULLs in a sort to the implementation: NULLS LAST ascending, NULLS FIRST descending, as in the reference results (2×)
    The benchmark text, against the submitted SQL
    SELECT  request_type,  status,  count(*) AS request_count,  min(received_at)::date AS earliest_received_at,  max(received_at)::date AS latest_received_at,  round(    percentile_cont(0.5) WITHIN GROUP (      ORDER BY extract(epoch FROM (completed_at - received_at)) / 86400.0    ) FILTER (WHERE completed_at IS NOT NULL),    1  ) AS median_days_to_close  CAST(min(received_at) AS date) AS earliest_received_at,  CAST(max(received_at) AS date) AS latest_received_at,  {{percentile_cont_filter(0.5, {{seconds_between(received_at, completed_at)}} / 86400.0, completed_at IS NOT NULL)}} AS median_days_to_closeFROM data_subject_requestsGROUP BY request_type, statusORDER BY request_type, statusORDER BY request_type NULLS LAST, status NULLS LAST
    SELECT
      request_type,
      status,
      count(*) AS request_count,
      CAST(min(received_at) AS date) AS earliest_received_at,
      CAST(max(received_at) AS date) AS latest_received_at,
      PERCENTILE_CONT(0.5) WITHIN GROUP (ORDER BY CAST(EXTRACT(EPOCH FROM (completed_at - received_at)) AS NUMERIC(18,6)) / 86400.0) FILTER (WHERE completed_at IS NOT NULL) AS median_days_to_close
    FROM data_subject_requests
    GROUP BY request_type, status
    ORDER BY request_type NULLS LAST, status NULLS LAST
    1 ms10 ms100 msHyper32.6 msDuckDB7.6 msGizmoSQL9.1 msclickhouse_brew17.3 msFirebolt11.8 msDataFusion28.9 msClickHouse55.7 ms
  8. Everything, as recorded

    The agents' own records, as the role play wrote them; only the personal data of the person who ran it is redacted

    Felix's whole session, 7 turns
    • The request, as Felix received it
      Report request from Priyanka Desai (analyst for the Data Protection Officer):
      
      Title: Privacy request volume reconciliation: counts by type and status
      Question: What is the defensible, auditable count of privacy (DSAR) requests by type and status, so we can reconcile against the ~48 figure quoted elsewhere and the 60 we found last week before briefing the regulator?
      Grain: one row per (request_type, status) combination, across full history, all tenants
      Columns:
      - request_type
      - status
      - count
      - earliest received_at (date)
      - latest received_at (date)
      - median days to close (completed_at minus received_at, in days, for rows where completed_at is not null; blank if none)
      Details: Source: data_subject_requests, no date or tenant filter (full history, platform-wide, matching what last week's reports covered). Group by request_type and status exactly as stored (do not normalize casing) so we can see if any unexpected type/status strings exist. This is meant to be the single ground-truth table that explains how other reported totals (e.g. Risk & Payments' ~48) might be a subset of ours (e.g. excluding a status or request_type) — order by request_type, then status, so all rows for a type are grouped together.
      
      Check your query with the warehouse's dry_run tool, then hand it in with submit.
    • Felix calls dry_run
      SELECT
        request_type,
        status,
        count(*) AS request_count,
        min(received_at)::date AS earliest_received_at,
        max(received_at)::date AS latest_received_at,
        round(
          percentile_cont(0.5) WITHIN GROUP (
            ORDER BY extract(epoch FROM (completed_at - received_at)) / 86400.0
          ) FILTER (WHERE completed_at IS NOT NULL),
          1
        ) AS median_days_to_close
      FROM data_subject_requests
      GROUP BY request_type, status
      ORDER BY request_type, status
    • The warehouse answers
      STATUS: COMPILES (dry run on the empty schema, no data read)
      COLUMNS: request_type, status, request_count, earliest_received_at, latest_received_at, median_days_to_close
    • FelixQuery compiles cleanly with the right columns. Submitting now.
    • Felix calls submit
      SELECT
        request_type,
        status,
        count(*) AS request_count,
        min(received_at)::date AS earliest_received_at,
        max(received_at)::date AS latest_received_at,
        round(
          percentile_cont(0.5) WITHIN GROUP (
            ORDER BY extract(epoch FROM (completed_at - received_at)) / 86400.0
          ) FILTER (WHERE completed_at IS NOT NULL),
          1
        ) AS median_days_to_close
      FROM data_subject_requests
      GROUP BY request_type, status
      ORDER BY request_type, status
    • The warehouse answers
      Submitted to tonight's batch. Your work on this request is done.
    • FelixSubmitted. The report groups `data_subject_requests` by `(request_type, status)` exactly as stored, with count, earliest/latest `received_at`, and median days-to-close (NULL where no rows have `completed_at`) — full history, no tenant filter, ordered by type then status so Priyanka can trace how the ~48 and ~60 figures reconcile against the ground truth.