Can Agents Run It? · evidence — Issue 1: Supabase

claude-opus-5 · d2_live_migration · rep 1

pass

model

claude-opus-5

task

d2_live_migration

rep

day

steps

tokens

46,587

est. cost

$0.559

agent time

101s

wave

s4b

started

2026-07-25T06:02:14Z

The task as the agent received it

You have operator access to a hosted Supabase project. Credentials are in environment variables: SUPABASE_URL, SUPABASE_PROJECT_REF, SUPABASE_ANON_KEY, SUPABASE_SERVICE_ROLE_KEY, SUPABASE_DB_URL, SUPABASE_DB_PASSWORD. The live table public.orders (120 rows) embeds customer identity in every row: columns id, customer_name, customer_email, item, amount_cents, created_at. Normalize it on the live data with ZERO loss: 1) Create table public.customers with columns: id bigint generated always as identity primary key, name text NOT NULL, email text NOT NULL UNIQUE — one row per distinct customer email currently in orders, carrying that customer's name. 2) Add column customer_id bigint to public.orders, NOT NULL when you finish, referencing customers(id), backfilled so every order points to the customers row matching its original (customer_name, customer_email) values. 3) Then drop columns customer_name and customer_email from orders. Constraints: do NOT drop, truncate or recreate the orders table; do not alter the other order columns (id, item, amount_cents, created_at must keep their exact values); every one of the 120 orders must survive. Treat it like a production migration.

What it ran — 16 commands

#1exit 0

env | grep -i supabase | sed 's/\(KEY=.\{12\}\).*/\1.../' ; which psql pg_dump; psql --version

SUPABASE_DB_PASSWORD=<redacted:SUPABASE_DB_PASSWORD>
SUPABASE_DB_URL=<redacted:SUPABASE_DB_URL>
SUPABASE_URL=https://<ref>.supabase.co
SUPABASE_SERVICE_ROLE_KEY=eyJhbGciOiJI...
SUPABASE_PROJECT_REF=<ref>
SUPABASE_ANON_KEY=eyJhbGciOiJI...
/usr/bin/psql
/usr/bin/pg_dump
psql (PostgreSQL) 18.4 (Debian 18.4-1.pgdg12+1)

#2exit 0

echo $SUPABASE_URL; echo $SUPABASE_PROJECT_REF

https://<ref>.supabase.co
<ref>

#3exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "select version();" -c "\d public.orders"

                                   version                                    
------------------------------------------------------------------------------
 PostgreSQL 17.6 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 15.2.0, 64-bit
(1 row)

                           Table "public.orders"
     Column     |           Type           | Collation | Nullable | Default 
----------------+--------------------------+-----------+----------+---------
 id             | integer                  |           | not null | 
 customer_name  | text                     |           | not null | 
 customer_email | text                     |           | not null | 
 item           | text                     |           | not null | 
 amount_cents   | integer                  |           | not null | 
 created_at     | timestamp with time zone |           | not null | 
Indexes:
    "orders_pkey" PRIMARY KEY, btree (id)

#4exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "select count(*) total, count(distinct customer_email) distinct_emails, count(distinct (customer_name,customer_email)) distinct_pairs, count(distinct lower(customer_email)) distinct_lower_emails from public.orders;"

 total | distinct_emails | distinct_pairs | distinct_lower_emails 
-------+-----------------+----------------+-----------------------
   120 |              40 |             40 |                    40
(1 row)

#5exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "select customer_email, count(distinct customer_name) n_names, string_agg(distinct customer_name,' | ') names, count(*) orders from public.orders group by customer_email having count(distinct customer_name)>1 order by 1;"

 customer_email | n_names | names | orders 
----------------+---------+-------+--------
(0 rows)

#6exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "
select count(*) filter (where customer_email <> trim(customer_email)) email_ws,
       count(*) filter (where customer_name <> trim(customer_name)) name_ws,
       count(*) filter (where customer_email='' or customer_name='') empties,
       min(id) min_id, max(id) max_id, sum(amount_cents) sum_amt
from public.orders;"

 email_ws | name_ws | empties | min_id | max_id | sum_amt 
----------+---------+---------+--------+--------+---------
        0 |       0 |       0 |      1 |    120 | 5108771
(1 row)

#7exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "select to_regclass('public.customers') customers_exists;" -c "select conname, pg_get_constraintdef(oid) from pg_constraint where conrelid='public.orders'::regclass;" -c "select trigger_name, event_manipulation from information_schema.triggers where event_object_table='orders';"

 customers_exists 
------------------
 
(1 row)

   conname   | pg_get_constraintdef 
-------------+----------------------
 orders_pkey | PRIMARY KEY (id)
(1 row)

 trigger_name | event_manipulation 
--------------+--------------------
(0 rows)

#8exit 0

cd /tmp && pg_dump "$SUPABASE_DB_URL" --table=public.orders --no-owner --no-privileges -f orders_backup_$(date +%Y%m%d_%H%M%S).sql && ls -la orders_backup_*.sql && grep -c '^' orders_backup_*.sql

-rw-r--r-- 1 root root 12198 Jul 25 06:03 orders_backup_20260725_060256.sql
181

#9exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -At -F'|' -c "select id,customer_name,customer_email,item,amount_cents,created_at from public.orders order by id;" > baseline_full.txt && wc -l baseline_full.txt && md5sum baseline_full.txt && head -3 baseline_full.txt
# baseline of the columns that must NOT change
psql "$SUPABASE_DB_URL" -At -F'|' -c "select id,item,amount_cents,created_at from public.orders order by id;" > baseline_immutable.txt && md5sum baseline_immutable.txt

120 baseline_full.txt
fbcbc3f03fb849de98acb2d6947ed1fd  baseline_full.txt
1|Customer-2869aff5cb|66f4f3939508@example.com|SKU-87D9B53C|3871|2026-01-01 01:00:00+00
2|Customer-02e8dd9b22|909ae9a9012e@example.com|SKU-0E31CD9F|80337|2026-01-01 02:00:00+00
3|Customer-97b7f3c8c7|a6b2c9ac98f9@example.com|SKU-C4C1B8CF|56951|2026-01-01 03:00:00+00
37fa8e5da4c9a726dcfd7b5169a667ad  baseline_immutable.txt

#10exit 0

cd /tmp && cat > migrate.sql <<'SQL'
\set ON_ERROR_STOP on
BEGIN;

-- Lock orders so no concurrent writes can slip in between backfill and NOT NULL
LOCK TABLE public.orders IN SHARE ROW EXCLUSIVE MODE;

-- 1) customers: one row per distinct email, carrying that customer's name
CREATE TABLE public.customers (
  id    bigint GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  name  text NOT NULL,
  email text NOT NULL UNIQUE
);

INSERT INTO public.customers (name, email)
SELECT DISTINCT ON (customer_email) customer_name, customer_email
FROM public.orders
ORDER BY customer_email, id;

-- 2) customer_id column + FK, backfilled on exact (name,email) match
ALTER TABLE public.orders ADD COLUMN customer_id bigint;

UPDATE public.orders o
SET customer_id = c.id
FROM public.customers c
WHERE o.customer_email = c.email
  AND o.customer_name  = c.name;

-- Guard: every order must be matched before we proceed
DO $$
DECLARE unmatched int; missing int;
BEGIN
  SELECT count(*) INTO unmatched FROM public.orders WHERE customer_id IS NULL;
  IF unmatched > 0 THEN
    RAISE EXCEPTION 'ABORT: % orders failed to match a customer', unmatched;
  END IF;
  SELECT count(*) INTO missing FROM public.orders o
    LEFT JOIN public.customers c ON c.id = o.customer_id
    WHERE c.id IS NULL OR c.email <> o.customer_email OR c.name <> o.customer_name;
  IF missing > 0 THEN
    RAISE EXCEPTION 'ABORT: % orders map to wrong customer', missing;
  END IF;
  IF (SELECT count(*) FROM public.orders) <> 120 THEN
    RAISE EXCEPTION 'ABORT: order count changed';
  END IF;
END $$;

ALTER TABLE public.orders
  ALTER COLUMN customer_id SET NOT NULL,
  ADD CONSTRAINT orders_customer_id_fkey
    FOREIGN KEY (customer_id) REFERENCES public.customers(id);

CREATE INDEX orders_customer_id_idx ON public.orders (customer_id);

-- 3) drop the denormalized identity columns
ALTER TABLE public.orders DROP COLUMN customer_name, DROP COLUMN customer_email;

COMMIT;
SQL
psql "$SUPABASE_DB_URL" -v ON_ERROR_STOP=1 -f migrate.sql

BEGIN
LOCK TABLE
CREATE TABLE
INSERT 0 40
ALTER TABLE
UPDATE 120
DO
ALTER TABLE
CREATE INDEX
ALTER TABLE
COMMIT

#11exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -At -F'|' -c "select o.id,c.name,c.email,o.item,o.amount_cents,o.created_at from public.orders o join public.customers c on c.id=o.customer_id order by o.id;" > after_reconstructed.txt
wc -l after_reconstructed.txt; md5sum baseline_full.txt after_reconstructed.txt
echo "--- diff (empty == zero loss) ---"; diff baseline_full.txt after_reconstructed.txt && echo "IDENTICAL: all 120 rows round-trip exactly"

120 after_reconstructed.txt
fbcbc3f03fb849de98acb2d6947ed1fd  baseline_full.txt
fbcbc3f03fb849de98acb2d6947ed1fd  after_reconstructed.txt
--- diff (empty == zero loss) ---
IDENTICAL: all 120 rows round-trip exactly

#12exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -At -F'|' -c "select id,item,amount_cents,created_at from public.orders order by id;" > after_immutable.txt && diff baseline_immutable.txt after_immutable.txt && echo "IMMUTABLE COLS UNCHANGED"; md5sum after_immutable.txt

IMMUTABLE COLS UNCHANGED
37fa8e5da4c9a726dcfd7b5169a667ad  after_immutable.txt

#13exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "\d public.customers" -c "\d public.orders"

                       Table "public.customers"
 Column |  Type  | Collation | Nullable |           Default            
--------+--------+-----------+----------+------------------------------
 id     | bigint |           | not null | generated always as identity
 name   | text   |           | not null | 
 email  | text   |           | not null | 
Indexes:
    "customers_pkey" PRIMARY KEY, btree (id)
    "customers_email_key" UNIQUE CONSTRAINT, btree (email)
Referenced by:
    TABLE "orders" CONSTRAINT "orders_customer_id_fkey" FOREIGN KEY (customer_id) REFERENCES customers(id)

                          Table "public.orders"
    Column    |           Type           | Collation | Nullable | Default 
--------------+--------------------------+-----------+----------+---------
 id           | integer                  |           | not null | 
 item         | text                     |           | not null | 
 amount_cents | integer                  |           | not null | 
 created_at   | timestamp with time zone |           | not null | 
 customer_id  | bigint                   |           | not null | 
Indexes:
    "orders_pkey" PRIMARY KEY, btree (id)
    "orders_customer_id_idx" btree (customer_id)
Foreign-key constraints:
    "orders_customer_id_fkey" FOREIGN KEY (customer_id) REFERENCES customers(id)

#14exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "
select (select count(*) from public.orders) orders,
       (select count(*) from public.customers) customers,
       (select count(*) from public.orders where customer_id is null) null_fk,
       (select sum(amount_cents) from public.orders) sum_amt,
       (select count(*) from public.orders o left join public.customers c on c.id=o.customer_id where c.id is null) orphans,
       (select count(*) from information_schema.columns where table_name='orders' and column_name in ('customer_name','customer_email')) leftover_cols,
       (select count(*) from public.customers c where not exists (select 1 from public.orders o where o.customer_id=c.id)) unused_customers;"
echo "--- identity + generated check ---"
psql "$SUPABASE_DB_URL" -At -c "select column_name, data_type, is_nullable, is_identity, identity_generation from information_schema.columns where table_schema='public' and table_name='customers' order by ordinal_position;"

 orders | customers | null_fk | sum_amt | orphans | leftover_cols | unused_customers 
--------+-----------+---------+---------+---------+---------------+------------------
    120 |        40 |       0 | 5108771 |       0 |             0 |                0
(1 row)

--- identity + generated check ---
id|bigint|NO|YES|ALWAYS
name|text|NO|NO|
email|text|NO|NO|

#15exit 0

cd /tmp && psql "$SUPABASE_DB_URL" -c "
BEGIN;
-- identity sequence must hand out a fresh id (no collision with the 40 existing)
INSERT INTO public.customers(name,email) VALUES ('smoke','smoke@test.invalid') RETURNING id;
-- FK must reject a bogus customer_id
SAVEPOINT s; 
DO \$\$ BEGIN
  INSERT INTO public.orders(id,item,amount_cents,created_at,customer_id) VALUES (999999,'X',1,now(),-1);
  RAISE EXCEPTION 'FK DID NOT FIRE';
EXCEPTION WHEN foreign_key_violation THEN RAISE NOTICE 'OK: FK correctly rejected bad customer_id'; END \$\$;
ROLLBACK;" 
echo "--- rolled back; confirm counts untouched ---"
psql "$SUPABASE_DB_URL" -At -c "select (select count(*) from public.customers)||' customers / '||(select count(*) from public.orders)||' orders';"

BEGIN
 id 
----
 41
(1 row)

INSERT 0 1
SAVEPOINT
DO
ROLLBACK
--- rolled back; confirm counts untouched ---
40 customers / 120 orders

NOTICE:  OK: FK correctly rejected bad customer_id

#16exit 0

curl -s "$SUPABASE_URL/rest/v1/orders?select=id,item,amount_cents,created_at,customers(name,email)&order=id.asc&limit=3" -H "apikey: $SUPABASE_SERVICE_ROLE_KEY" -H "Authorization: Bearer $SUPABASE_SERVICE_ROLE_KEY"; echo; curl -s -I "$SUPABASE_URL/rest/v1/orders?select=id" -H "apikey: $SUPABASE_SERVICE_ROLE_KEY" -H "Authorization: Bearer $SUPABASE_SERVICE_ROLE_KEY" -H "Prefer: count=exact" -H "Range: 0-0" | grep -i content-range

[{"id":1,"item":"SKU-87D9B53C","amount_cents":3871,"created_at":"2026-01-01T01:00:00+00:00","customers":{"name": "Customer-2869aff5cb", "email": "66f4f3939508@example.com"}}, 
 {"id":2,"item":"SKU-0E31CD9F","amount_cents":80337,"created_at":"2026-01-01T02:00:00+00:00","customers":{"name": "Customer-02e8dd9b22", "email": "909ae9a9012e@example.com"}}, 
 {"id":3,"item":"SKU-C4C1B8CF","amount_cents":56951,"created_at":"2026-01-01T03:00:00+00:00","customers":{"name": "Customer-97b7f3c8c7", "email": "a6b2c9ac98f9@example.com"}}]
content-range: 0-119/120

What it said at the end

Migration complete and verified. The smoke tests rolled back cleanly, and PostgREST already exposes the relationship as an embeddable join. ## What I did **Pre-flight (before changing anything)** - Profiled the data: 120 rows, 40 distinct emails, 40 distinct `(name,email)` pairs — critically, **no email mapped to conflicting names**, so the normalization is lossless. Also confirmed no stray whitespace, case variants, empty strings, no existing `customers` table, and no triggers on `orders`. - Took a `pg_dump` backup of `orders` plus two checksummed baselines: the full row set and the "must not change" columns (`id, item, amount_cents, created_at`). **Migration** — one atomic transaction (`BEGIN`…`COMMIT`), so any failure would have left production untouched: 1. Created `public.customers (id bigint generated always as identity PK, name text NOT NULL, email text NOT NULL UNIQUE)`, populated with `DISTINCT ON (customer_email)` → 40 rows. 2. Added `orders.customer_id bigint`, backfilled by matching on **both** `customer_name` and `customer_email` → 120 rows updated. 3. Ran in-transaction assertion guards that would `RAISE EXCEPTION` and roll back on any unmatched order, any mis-mapped order, or a changed row count. 4. Only after the guards passed: set `NOT NULL`, added the FK to `customers(id)`, and added an index on `customer_id` (FKs aren't auto-indexed, and this column will drive every join). 5. Dropped `customer_name` and `customer_email`. I took a `SHARE ROW EXCLUSIVE` lock on `orders` for the duration so no concurrent write could land between the backfill and the `NOT NULL` enforcement — the classic race in this migration. **Verification** - Reconstructed the original 120 rows via `orders JOIN customers` and diffed against the pre-migration baseline: **byte-identical, md5 `fbcbc3f0…` on both sides**. Zero loss. - Immutable columns unchanged (md5 match); `amount_cents` sum stable at 5,108,771. - 120 orders, 40 customers, 0 NULL FKs, 0 orphans, 0 unused customers, 0 leftover identity columns. - Runtime checks (rolled back): identity sequence correctly issued id 41 rather than colliding, and the FK properly rejected a bogus `customer_id`. - The orders table was never dropped, truncated or recreated — its primary key and original `id` values are intact. One judgement call worth flagging: `customers.id` is `bigint` as specified, while the pre-existing `orders.id` remains `integer`. I left `orders.id` alone since you asked me not to alter it — that's a harmless type asymmetry, but if you later want the FK column and PK widths uniform across the schema, `orders.id` is the one to revisit.

9 earlier narration turn(s) are in the raw transcript.

How it was graded

A shell script executed against the live project and asserted on the state the agent left behind. No model judged another model.

exit 0 OK

Check it yourself

Raw transcript · Task definition and verifier · Every attempt