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Sep 29, 2026Order list spins when scrolled far down, and the larger the offset the slower it gets—can I just reduce the page size?Deep pagination in an order list getting slow is usually not because the page size is too ...View details
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Sep 28, 2026When an event starts and the API is saturated, with QPS jumping from steady to event peak, is gateway-only rate limiting missing something?When an API is saturated at the start of an event, it is usually not because the threshold ...View details
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Sep 27, 2026Bulk imports went from minutes to over ten minutes—are there too many indexes on the table?When indexes pile up, slower writes are usually not an illusion but the added cost of main ...View details
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Sep 26, 2026Operations needs to export 100,000 order rows at once, but the API keeps running out of memory—do we have to make them export in batches?Large table exports drain API memory, but the root cause is often three things stacked tog ...View details
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Sep 25, 2026After phone numbers are encrypted, can ops only decrypt the whole table to look up users by number?After phone numbers are encrypted, ops do not have to decrypt the whole table to look up u ...View details
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Sep 24, 2026Inventory and orders update at the same time and occasionally report Deadlock found—can increasing retry counts alone suppress it?Inventory and order entry points update the same rows at the same time and occasionally re ...View details
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Sep 23, 2026Container service restarts at night with only "Killed" in the log: does raising the memory limit fix it?A service restarts in a container at night and the log shows only "Killed"—most often the ...View details
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Sep 22, 2026When a user's nickname contains emoji, saving fails—can changing only that column to utf8mb4 fix it?When emoji in nicknames fail to save or turn into question marks, it is usually not a sing ...View details
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Sep 21, 2026Customer A logged in and saw Customer B's orders: can adding a tenant column in a shared database stop it right away?Cross-tenant data leaks are usually not database failures—tenant context was lost at some ...View details
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Sep 20, 2026Admin panel bans a user, but the App can still place orders—why can't JWT be revoked?For requirements such as banning, kicking users offline, or logging out other clients afte ...View details
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Sep 19, 2026Order ID trailing digits become 0 on the front end: can you just use BigInt without changing the API?A 19-digit Long order ID returned directly as a JSON number may be rounded by the browser ...View details
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Sep 18, 2026Inventory deduction with read-then-write keeps overselling—should I lock first, or combine validation and write into one statement?Deducting stock with read-then-write easily causes overselling, but the root cause is ofte ...View details
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Sep 16, 2026A Composite Index Is Built, but the Query Uses Only the Last Column and Still Does a Full Table Scan—Should You Add a Single-Column Index?When a composite index is used but the query includes only the last column, SQL may not us ...View details
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Sep 15, 2026Cache expiration times are all set the same, and the database suddenly maxes out at 1 a.m.—is it because the keys expire at the same time?When cache keys share the same expiration time, they expire together, requests fall back t ...View details
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Sep 14, 2026Order amounts stored as decimals—reconciliation always off by a few cents—is floating-point precision the culprit?Order amounts stored as decimals look fine per transaction, but at month-end reconciliatio ...View details
