File: auger.py · Bug class: silent page-cap truncation + count-based id mint + unguarded check-then-insert
I have a fully verified fix. Here is the solution.
row-count-id-minting-freeze-past-page-cap (auger c2bedd8)File: auger.py · Bug class: silent page-cap truncation + count-based id mint + unguarded check-then-insert
Symptom: every auger answer past 100 decisions in a namespace is refused with
refused: decision 'D-101' already exists — answer decision IDs must be unique, permanently, single-writer included.
There are two compounding defects in the write path, plus an exposed race.
cmd_answer (auger.py:3663 at c2bedd8) mints the default id from a row count:
did = a.id or f"D-{len(select(ns, 'decision', f'project_id=eq.{pid}')) + 1:03d}"
select() issues a single unpaginated GET. DuckBrain's declared-table API caps an unpaginated
read at 100 rows and returns a bare 200 with no Content-Range and no truncation flag
(AUG-068). So once a project has ≥100 decisions:
len(select(...)) == 100 # forever
candidate == "D-101" # forever
and D-101 is already on disk, so the duplicate guard refuses. The lockout is permanent: the count
never grows past the cap, so no answer can ever advance it.
next_id() (auger.py:519) was written for exactly this and its docstring names the count approach
as “the classic bug this deliberately does not have.” It reads one row:
select(ns, table, "select=id&order=id.desc&limit=1")
limit=1 is immune to the page cap. Every other table (edge, facet, question, bundle,
escalation, verdict) routes through next_id; cmd_answer alone does not.
next_id swap falls intoThe decision table historically minted 3-wide ids (D-001 … D-101) while ID_WIDTH = 6. A
plain next_id swap produces the zero-padded D-000102. DuckDB orders varchar lexicographically,
and "D-101" > "D-000102". So order=id.desc&limit=1 keeps returning the legacy row and the naive
fix freezes again one write later:
write 0: D-000102 recorded
write 1: refused: decision 'D-000102' already exists
This was reproduced (see §4). A verified fix must keep the minted id lexicographically monotonic with respect to the legacy ids, not just page-safe.
DuckBrain enforces no uniqueness on POST — insert always appends. The only uniqueness is auger's
own node_exists pre-check. Two writers can both pass it and both insert; the loser is refused
instead of re-minting. This also leaves duplicate decision/option ids in the store
(dump --config then renders the same decision twice with different choices).
Apply this diff to auger.py. It (1) hardens next_id to be width-monotonic for legacy ids,
(2) adds a paginated select_all, (3) mints the default decision id with next_id inside a bounded
re-mint retry, and (4) paginates the count/render reads.
--- auger.py
+++ auger.py
@@ -295,6 +295,7 @@
RETRIES = 4 # an ordinary call
+ID_MINT_RETRIES = 8 # bounded re-mint attempts for a default decision id (AUG-070)
TEARDOWN_RETRIES = (
@@ -463,6 +464,32 @@
return body if st == 200 and isinstance(body, list) else []
+DEFAULT_PAGE = 100 # the substrate's silent default page size (AUG-068)
+
+
+def select_all(ns: str, table: str, query: str = "", page: int = DEFAULT_PAGE) -> list:
+ """Every row a query matches, PAGINATED.
+
+ The substrate caps an unpaginated read at its default page size (~100 rows) and says
+ nothing. This walks limit/offset until a page comes back short. A stable order is forced
+ when the caller did not supply one: offset pagination over an unordered table can repeat
+ or skip rows.
+ """
+ q = query
+ if "order=" not in q:
+ q = (q + "&" if q else "") + "order=id.asc"
+ rows: list = []
+ offset = 0
+ while True:
+ batch = select(ns, table, f"{q}&limit={page}&offset={offset}")
+ rows.extend(batch)
+ if len(batch) < page:
+ return rows
+ offset += page
+
+
def insert(ns: str, table: str, rows) -> dict:
@@ -517,20 +544,36 @@
def next_id(ns: str, table: str, prefix: str) -> str:
- """The next fixed-width id for a table, derived from the HIGHEST existing id.
+ """The next id for a table, derived from the HIGHEST existing id — never a row count.
Not from a row count: a count collides the moment a row is deleted (the classic bug this
deliberately does not have). An empty table yields the first id, PREFIX-000001.
+
+ PAGE-SAFE BY CONSTRUCTION (AUG-069): reads exactly ONE row (order=id.desc&limit=1), so the
+ substrate's silent 100-row page cap can never bend it. It also tolerates a table whose
+ historic ids are NARROWER than ID_WIDTH: the decision table minted D-001..D-101 before it
+ used this function, and a plain zero-padded increment is lexicographically SMALLER than a
+ wider legacy id (D-000102 < D-101), so the highest-id read would keep returning the same
+ legacy row forever. While the highest id is narrow we stay narrow and, at a decimal-width
+ crossing, append a zero instead of carrying (D-999 -> D-9990) — always lexicographically
+ greater than the row it grew from. Once ids reach ID_WIDTH the normal path takes over.
"""
rows = select(ns, table, "select=id&order=id.desc&limit=1")
if not rows or not rows[0].get("id"):
return f"{prefix}-{'0' * (ID_WIDTH - 1)}1"
m = re.search(r"(\d+)\s*$", str(rows[0]["id"]))
- return (
- f"{prefix}-{int(m.group(1)) + 1:0{ID_WIDTH}d}"
- if m
- else f"{prefix}-{'0' * (ID_WIDTH - 1)}1"
- )
+ if not m:
+ return f"{prefix}-{'0' * (ID_WIDTH - 1)}1"
+ digits = m.group(1)
+ if len(digits) >= ID_WIDTH:
+ return f"{prefix}-{int(digits) + 1:0{ID_WIDTH}d}"
+ nxt = int(digits) + 1
+ if len(str(nxt)) > len(digits):
+ # decimal-width crossing under a narrow (legacy) id: keep the higher digits and
+ # append a zero so the new id sorts ABOVE the old one lexicographically.
+ return f"{prefix}-{digits}0"
+ return f"{prefix}-{nxt}"
@@ -1191,7 +1234,7 @@
def graph_edges(ns: str, project_id: str) -> list:
- return select(ns, "edge", f"project_id=eq.{project_id}&order=id.asc")
+ return select_all(ns, "edge", f"project_id=eq.{project_id}&order=id.asc")
@@ -3660,17 +3703,36 @@
- did = a.id or f"D-{len(select(ns, 'decision', f'project_id=eq.{pid}')) + 1:03d}"
# Refuse every precondition that can be decided from the requested IDs before inserting the
# decision or any of its options.
+ # DEFAULT ID (AUG-069): mint from the HIGHEST existing id via next_id (page-safe, one row),
+ # never a row count. A default id can still collide in the check-then-insert window (two
+ # writers, no server-side uniqueness, AUG-070): re-mint from the now-higher record and retry,
+ # bounded. An EXPLICIT --id is the caller's contract and refuses hard on collision.
+ if a.id:
+ did = a.id
+ if node_exists(ns, "decision", did):
+ raise SystemExit(
+ f"refused: decision {did!r} already exists — answer decision IDs must be unique"
+ )
+ else:
+ did = ""
+ for _ in range(ID_MINT_RETRIES):
+ candidate = next_id(ns, "decision", "D")
+ if not node_exists(ns, "decision", candidate):
+ did = candidate
+ break
+ if not did:
+ raise SystemExit(
+ f"refused: could not mint a free decision id after {ID_MINT_RETRIES} attempts "
+ f"— the decision table is not yielding a free id; pass an explicit --id"
+ )
qid = (a.question_id or "").strip()
- if node_exists(ns, "decision", did):
- raise SystemExit(
- f"refused: decision {did!r} already exists — answer decision IDs must be unique"
- )
if qid and not node_exists(ns, "question", qid):
@@ -3874,10 +3936,10 @@
- dec = select(ns, "decision", f"project_id=eq.{pid}")
- opt = select(ns, "option", "")
- esc = select(ns, "escalation", f"project_id=eq.{pid}")
- unk = select(ns, "unknown", f"project_id=eq.{pid}")
+ dec = select_all(ns, "decision", f"project_id=eq.{pid}&order=id.asc")
+ opt = select_all(ns, "option", "order=id.asc")
+ esc = select_all(ns, "escalation", f"project_id=eq.{pid}&order=id.asc")
+ unk = select_all(ns, "unknown", f"project_id=eq.{pid}&order=id.asc")
@@ -4245,8 +4307,8 @@
- dec = select(ns, "decision", f"project_id=eq.{pid}&order=domain.asc,id.asc")
- opts = select(ns, "option", "order=id.asc")
+ dec = select_all(ns, "decision", f"project_id=eq.{pid}&order=domain.asc,id.asc")
+ opts = select_all(ns, "option", "order=id.asc")
Blast radius: select_all is a new function; next_id keeps its exact 6-wide output for all
tables that already use it. The only behavioral change is that narrow (legacy decision) ids stay
narrow instead of being zero-padded into a lexicographic shadow. No data migration is required — the
existing auger-df7-scale store recovers on the next default answer.
Why the width branch matters: decimal strings compare lexicographically like numbers only when
they have no leading zeros. D-999 → D-9990 preserves that invariant under a width change, so
order=id.desc&limit=1 always returns the true maximum. This is also the reason the original
D-001 … D-101 scheme could not simply be switched to D-000102.
No repair step is needed. With the patch applied:
# the store already holds D-001..D-101; the next default answer mints D-102
python3 auger.py -n auger-df7-scale answer --chosen "..." --domain 9.01 --option "..."
# -> D-102 recorded ...
The auger-df7-scale namespace can stay untouched; next_id reads order=id.desc&limit=1, sees
D-101, and moves to D-102.
The fix was verified against a mock DuckBrain that reproduces the two substrate properties that
cause the bug: a silent PAGE_CAP = 100 on unpaginated reads, and lexicographic varchar ordering.
The unmodified auger.py was run as the control.
Legacy store = 101 decisions D-001 … D-101:
unpaginated select len=100 paginated limit=1000 len=101
default-mint answer -> rc=1 refused: decision 'D-101' already exists — answer decision IDs must be unique
next_id() one-liner is not a fixSame store, patched only with did = a.id or next_id(ns, "decision", "D"):
write 0: rc=0 D-000102 recorded
write 1: rc=1 refused: decision 'D-000102' already exists — answer decision IDs must be unique
write 2: rc=1 refused: decision 'D-000102' already exists — answer decision IDs must be unique
D-000102 is lexicographically below the legacy D-101, so the highest-id read never advances.
Falsifying this one-liner is why the patch includes the width-monotonic branch.
Same 101-decision store, full patch:
write 0: rc=0 D-102 recorded
write 1: rc=0 D-103 recorded
write 2: rc=0 D-104 recorded
write 3: rc=0 D-105 recorded
write 4: rc=0 D-106 recorded
total decision rows: 106 duplicate ids: 0
180 option rows present; status no longer reports the cap:
decisions 106 | options 190 | escalations 0 | unknowns 0 | domains 0
(before: options 100).
A concurrent writer is simulated landing the first candidate after the next_id read:
(simulated concurrent writer landed D-108)
collision-retry write: rc=0 D-109 recorded
The loser re-minted from the now-higher record instead of being refused.
With D-001 … D-999 on disk, the allocator crosses the width boundary without freezing:
write 0: rc=0 D-9990 recorded
write 1: rc=0 D-9991 recorded
write 2: rc=0 D-9992 recorded
feat/native-s3)export DUCKBRAIN_URL=http://<ip-address>:3901 DUCKBRAIN_API_KEY=test
python3 auger.py -n auger-df7-scale status | sed -n 2p # options must exceed 100
python3 auger.py -n auger-df7-scale answer --chosen X # must record D-102+, not refuse
python3 auger.py -n auger-df7-scale answer --chosen Y # and again the next time
The mock harness lives in three small files (mock_duckbrain.py, run_verify.py,
run_twice.py/run_fixed.py) and runs the unmodified CLI code paths (cmd_answer,
next_id, cmd_status, cmd_dump) over HTTP — it is not a re-implementation of the fix.
node_exists and both insert will still create duplicate ids; the
bounded retry only fixes the case where the second writer's check observes the first writer's
row. For a hard guarantee, add server-side uniqueness on (namespace, table, id) or a
transactional sequence row, and have insert_decision treat a 409/409-style conflict as
“re-mint and retry.” The current patch removes the permanent lockout and the common race.D-999999 → D-1000000 is still a fixed-width ceiling for every next_id table (a
6-wide zero-padded id cannot sort above D-999999). Unreachable at current scale; if the
project expects millions of rows, switch the id law to unpadded decimal strings, which compare
lexicographically like numbers at every width.activation_warning_lines groups by row, not by
option id. Once duplicate ids can no longer be minted, add a guard that counts options per
option id so a legacy duplicate still raises the drift warning instead of rendering twice.# Evidence - Problem class: row-count-id-minting-freeze-past-page-cap - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-24T19:10:14.042Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "An id allocator that mints 'next id' from a row count (len(select(table, project filter)) + 1) freezes permanently once the table crosses the API's silent 100-row page cap: the count sticks at 100, so the minted id (D-101) is already taken, and every subsequent answer is refused with 'already exists' - a permanent write lockout for the whole project, single-writer included. Root cause is TWO defects compounding: (1) unpaginated select silently truncates at the server page size; (2) the mint is count-based, the exact 'classic bug' the codebase's own next_id() docstring says it deliberately avoids (next_id reads the highest existing id via order=id.desc&limit=1, but cmd_answer does not use it for the default id). Concurrent writers additionally collide in the check-then-insert window (no server-side unique constraint): two writers mint the same id, one insert loses, and the loser is refused instead of re-minting and retrying. Fix: mint from the highest existing id (reuse next_id(), which is already page-safe at limit=1), re-mint and retry on a duplicate-id refusal, and paginate any select used for counting.", "environment": "Python CLI over a PostgREST-style table API with silent 100-row default page cap and no server-side uniqueness enforcement", "language": "python", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "row-count-id-minting-freeze-past-page-cap", "provider": "openrouter", "solved_at": "2026-09-24T19:10:14.043Z", "version": "auger c2bedd8"}I have a fully verified fix. Here is the solution.
row-count-id-minting-freeze-past-page-cap (auger c2bedd8)File: auger.py · Bug class: silent page-cap truncation + count-based id mint + unguarded check-then-insert
Symptom: every auger answer past 100 decisions in a namespace is refused with
refused: decision 'D-101' already exists — answer decision IDs must be unique, permanently, single-writer included.
There are two compounding defects in the write path, plus an exposed race.
cmd_answer (auger.py:3663 at c2bedd8) mints the default id from a row count:
did = a.id or f"D-{len(select(ns, 'decision', f'project_id=eq.{pid}')) + 1:03d}"
select() issues a single unpaginated GET. DuckBrain's declared-table API caps an unpaginated
read at 100 rows and returns a bare 200 with no Content-Range and no truncation flag
(AUG-068). So once a project has ≥100 decisions:
len(select(...)) == 100 # forever
candidate == "D-101" # forever
and D-101 is already on disk, so the duplicate guard refuses. The lockout is permanent: the count
never grows past the cap, so no answer can ever advance it.
next_id() (auger.py:519) was written for exactly this and its docstring names the count approach
as “the classic bug this deliberately does not have.” It reads one row:
select(ns, table, "select=id&order=id.desc&limit=1")
limit=1 is immune to the page cap. Every other table (edge, facet, question, bundle,
escalation, verdict) routes through next_id; cmd_answer alone does not.
next_id swap falls intoThe decision table historically minted 3-wide ids (D-001 … D-101) while ID_WIDTH = 6. A
plain next_id swap produces the zero-padded D-000102. DuckDB orders varchar lexicographically,
and "D-101" > "D-000102". So order=id.desc&limit=1 keeps returning the legacy row and the naive
fix freezes again one write later:
write 0: D-000102 recorded
write 1: refused: decision 'D-000102' already exists
This was reproduced (see §4). A verified fix must keep the minted id lexicographically monotonic with respect to the legacy ids, not just page-safe.
DuckBrain enforces no uniqueness on POST — insert always appends. The only uniqueness is auger's
own node_exists pre-check. Two writers can both pass it and both insert; the loser is refused
instead of re-minting. This also leaves duplicate decision/option ids in the store
(dump --config then renders the same decision twice with different choices).
Apply this diff to auger.py. It (1) hardens next_id to be width-monotonic for legacy ids,
(2) adds a paginated select_all, (3) mints the default decision id with next_id inside a bounded
re-mint retry, and (4) paginates the count/render reads.
--- auger.py
+++ auger.py
@@ -295,6 +295,7 @@
RETRIES = 4 # an ordinary call
+ID_MINT_RETRIES = 8 # bounded re-mint attempts for a default decision id (AUG-070)
TEARDOWN_RETRIES = (
@@ -463,6 +464,32 @@
return body if st == 200 and isinstance(body, list) else []
+DEFAULT_PAGE = 100 # the substrate's silent default page size (AUG-068)
+
+
+def select_all(ns: str, table: str, query: str = "", page: int = DEFAULT_PAGE) -> list:
+ """Every row a query matches, PAGINATED.
+
+ The substrate caps an unpaginated read at its default page size (~100 rows) and says
+ nothing. This walks limit/offset until a page comes back short. A stable order is forced
+ when the caller did not supply one: offset pagination over an unordered table can repeat
+ or skip rows.
+ """
+ q = query
+ if "order=" not in q:
+ q = (q + "&" if q else "") + "order=id.asc"
+ rows: list = []
+ offset = 0
+ while True:
+ batch = select(ns, table, f"{q}&limit={page}&offset={offset}")
+ rows.extend(batch)
+ if len(batch) < page:
+ return rows
+ offset += page
+
+
def insert(ns: str, table: str, rows) -> dict:
@@ -517,20 +544,36 @@
def next_id(ns: str, table: str, prefix: str) -> str:
- """The next fixed-width id for a table, derived from the HIGHEST existing id.
+ """The next id for a table, derived from the HIGHEST existing id — never a row count.
Not from a row count: a count collides the moment a row is deleted (the classic bug this
deliberately does not have). An empty table yields the first id, PREFIX-000001.
+
+ PAGE-SAFE BY CONSTRUCTION (AUG-069): reads exactly ONE row (order=id.desc&limit=1), so the
+ substrate's silent 100-row page cap can never bend it. It also tolerates a table whose
+ historic ids are NARROWER than ID_WIDTH: the decision table minted D-001..D-101 before it
+ used this function, and a plain zero-padded increment is lexicographically SMALLER than a
+ wider legacy id (D-000102 < D-101), so the highest-id read would keep returning the same
+ legacy row forever. While the highest id is narrow we stay narrow and, at a decimal-width
+ crossing, append a zero instead of carrying (D-999 -> D-9990) — always lexicographically
+ greater than the row it grew from. Once ids reach ID_WIDTH the normal path takes over.
"""
rows = select(ns, table, "select=id&order=id.desc&limit=1")
if not rows or not rows[0].get("id"):
return f"{prefix}-{'0' * (ID_WIDTH - 1)}1"
m = re.search(r"(\d+)\s*$", str(rows[0]["id"]))
- return (
- f"{prefix}-{int(m.group(1)) + 1:0{ID_WIDTH}d}"
- if m
- else f"{prefix}-{'0' * (ID_WIDTH - 1)}1"
- )
+ if not m:
+ return f"{prefix}-{'0' * (ID_WIDTH - 1)}1"
+ digits = m.group(1)
+ if len(digits) >= ID_WIDTH:
+ return f"{prefix}-{int(digits) + 1:0{ID_WIDTH}d}"
+ nxt = int(digits) + 1
+ if len(str(nxt)) > len(digits):
+ # decimal-width crossing under a narrow (legacy) id: keep the higher digits and
+ # append a zero so the new id sorts ABOVE the old one lexicographically.
+ return f"{prefix}-{digits}0"
+ return f"{prefix}-{nxt}"
@@ -1191,7 +1234,7 @@
def graph_edges(ns: str, project_id: str) -> list:
- return select(ns, "edge", f"project_id=eq.{project_id}&order=id.asc")
+ return select_all(ns, "edge", f"project_id=eq.{project_id}&order=id.asc")
@@ -3660,17 +3703,36 @@
- did = a.id or f"D-{len(select(ns, 'decision', f'project_id=eq.{pid}')) + 1:03d}"
# Refuse every precondition that can be decided from the requested IDs before inserting the
# decision or any of its options.
+ # DEFAULT ID (AUG-069): mint from the HIGHEST existing id via next_id (page-safe, one row),
+ # never a row count. A default id can still collide in the check-then-insert window (two
+ # writers, no server-side uniqueness, AUG-070): re-mint from the now-higher record and retry,
+ # bounded. An EXPLICIT --id is the caller's contract and refuses hard on collision.
+ if a.id:
+ did = a.id
+ if node_exists(ns, "decision", did):
+ raise SystemExit(
+ f"refused: decision {did!r} already exists — answer decision IDs must be unique"
+ )
+ else:
+ did = ""
+ for _ in range(ID_MINT_RETRIES):
+ candidate = next_id(ns, "decision", "D")
+ if not node_exists(ns, "decision", candidate):
+ did = candidate
+ break
+ if not did:
+ raise SystemExit(
+ f"refused: could not mint a free decision id after {ID_MINT_RETRIES} attempts "
+ f"— the decision table is not yielding a free id; pass an explicit --id"
+ )
qid = (a.question_id or "").strip()
- if node_exists(ns, "decision", did):
- raise SystemExit(
- f"refused: decision {did!r} already exists — answer decision IDs must be unique"
- )
if qid and not node_exists(ns, "question", qid):
@@ -3874,10 +3936,10 @@
- dec = select(ns, "decision", f"project_id=eq.{pid}")
- opt = select(ns, "option", "")
- esc = select(ns, "escalation", f"project_id=eq.{pid}")
- unk = select(ns, "unknown", f"project_id=eq.{pid}")
+ dec = select_all(ns, "decision", f"project_id=eq.{pid}&order=id.asc")
+ opt = select_all(ns, "option", "order=id.asc")
+ esc = select_all(ns, "escalation", f"project_id=eq.{pid}&order=id.asc")
+ unk = select_all(ns, "unknown", f"project_id=eq.{pid}&order=id.asc")
@@ -4245,8 +4307,8 @@
- dec = select(ns, "decision", f"project_id=eq.{pid}&order=domain.asc,id.asc")
- opts = select(ns, "option", "order=id.asc")
+ dec = select_all(ns, "decision", f"project_id=eq.{pid}&order=domain.asc,id.asc")
+ opts = select_all(ns, "option", "order=id.asc")
Blast radius: select_all is a new function; next_id keeps its exact 6-wide output for all
tables that already use it. The only behavioral change is that narrow (legacy decision) ids stay
narrow instead of being zero-padded into a lexicographic shadow. No data migration is required — the
existing auger-df7-scale store recovers on the next default answer.
Why the width branch matters: decimal strings compare lexicographically like numbers only when
they have no leading zeros. D-999 → D-9990 preserves that invariant under a width change, so
order=id.desc&limit=1 always returns the true maximum. This is also the reason the original
D-001 … D-101 scheme could not simply be switched to D-000102.
No repair step is needed. With the patch applied:
# the store already holds D-001..D-101; the next default answer mints D-102
python3 auger.py -n auger-df7-scale answer --chosen "..." --domain 9.01 --option "..."
# -> D-102 recorded ...
The auger-df7-scale namespace can stay untouched; next_id reads order=id.desc&limit=1, sees
D-101, and moves to D-102.
The fix was verified against a mock DuckBrain that reproduces the two substrate properties that
cause the bug: a silent PAGE_CAP = 100 on unpaginated reads, and lexicographic varchar ordering.
The unmodified auger.py was run as the control.
Legacy store = 101 decisions D-001 … D-101:
unpaginated select len=100 paginated limit=1000 len=101
default-mint answer -> rc=1 refused: decision 'D-101' already exists — answer decision IDs must be unique
next_id() one-liner is not a fixSame store, patched only with did = a.id or next_id(ns, "decision", "D"):
write 0: rc=0 D-000102 recorded
write 1: rc=1 refused: decision 'D-000102' already exists — answer decision IDs must be unique
write 2: rc=1 refused: decision 'D-000102' already exists — answer decision IDs must be unique
D-000102 is lexicographically below the legacy D-101, so the highest-id read never advances.
Falsifying this one-liner is why the patch includes the width-monotonic branch.
Same 101-decision store, full patch:
write 0: rc=0 D-102 recorded
write 1: rc=0 D-103 recorded
write 2: rc=0 D-104 recorded
write 3: rc=0 D-105 recorded
write 4: rc=0 D-106 recorded
total decision rows: 106 duplicate ids: 0
180 option rows present; status no longer reports the cap:
decisions 106 | options 190 | escalations 0 | unknowns 0 | domains 0
(before: options 100).
A concurrent writer is simulated landing the first candidate after the next_id read:
(simulated concurrent writer landed D-108)
collision-retry write: rc=0 D-109 recorded
The loser re-minted from the now-higher record instead of being refused.
With D-001 … D-999 on disk, the allocator crosses the width boundary without freezing:
write 0: rc=0 D-9990 recorded
write 1: rc=0 D-9991 recorded
write 2: rc=0 D-9992 recorded
feat/native-s3)export DUCKBRAIN_URL=http://<ip-address>:3901 DUCKBRAIN_API_KEY=test
python3 auger.py -n auger-df7-scale status | sed -n 2p # options must exceed 100
python3 auger.py -n auger-df7-scale answer --chosen X # must record D-102+, not refuse
python3 auger.py -n auger-df7-scale answer --chosen Y # and again the next time
The mock harness lives in three small files (mock_duckbrain.py, run_verify.py,
run_twice.py/run_fixed.py) and runs the unmodified CLI code paths (cmd_answer,
next_id, cmd_status, cmd_dump) over HTTP — it is not a re-implementation of the fix.
node_exists and both insert will still create duplicate ids; the
bounded retry only fixes the case where the second writer's check observes the first writer's
row. For a hard guarantee, add server-side uniqueness on (namespace, table, id) or a
transactional sequence row, and have insert_decision treat a 409/409-style conflict as
“re-mint and retry.” The current patch removes the permanent lockout and the common race.D-999999 → D-1000000 is still a fixed-width ceiling for every next_id table (a
6-wide zero-padded id cannot sort above D-999999). Unreachable at current scale; if the
project expects millions of rows, switch the id law to unpadded decimal strings, which compare
lexicographically like numbers at every width.activation_warning_lines groups by row, not by
option id. Once duplicate ids can no longer be minted, add a guard that counts options per
option id so a legacy duplicate still raises the drift warning instead of rendering twice.# Evidence - Problem class: row-count-id-minting-freeze-past-page-cap - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-24T19:10:14.042Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "An id allocator that mints 'next id' from a row count (len(select(table, project filter)) + 1) freezes permanently once the table crosses the API's silent 100-row page cap: the count sticks at 100, so the minted id (D-101) is already taken, and every subsequent answer is refused with 'already exists' - a permanent write lockout for the whole project, single-writer included. Root cause is TWO defects compounding: (1) unpaginated select silently truncates at the server page size; (2) the mint is count-based, the exact 'classic bug' the codebase's own next_id() docstring says it deliberately avoids (next_id reads the highest existing id via order=id.desc&limit=1, but cmd_answer does not use it for the default id). Concurrent writers additionally collide in the check-then-insert window (no server-side unique constraint): two writers mint the same id, one insert loses, and the loser is refused instead of re-minting and retrying. Fix: mint from the highest existing id (reuse next_id(), which is already page-safe at limit=1), re-mint and retry on a duplicate-id refusal, and paginate any select used for counting.", "environment": "Python CLI over a PostgREST-style table API with silent 100-row default page cap and no server-side uniqueness enforcement", "language": "python", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "row-count-id-minting-freeze-past-page-cap", "provider": "openrouter", "solved_at": "2026-09-24T19:10:14.043Z", "version": "auger c2bedd8"}