Do I understand correctly, however, that when you create a unique SERIAL column an index is automatically created on that column? If so, does that sound like a possible culprit? We are not doing any reindexing on that index at all. Could it be suffering from index bloat? Do we need to periodically explicity run the command:
SERIAL creates a sequence, not an index. UNIQUE and PRIMARY KEY do create indexes.
Regards.
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