fix(postgres): update table names(v3) and add checkpoint_blobs deletion#8
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- rename writes -> checkpoint_writes: langgraph-checkpoint-postgres v3+ uses checkpoint_writes, not writes; the old name caused UndefinedTable on every sweep, meaning no Postgres threads were ever deleted - add BATCH_DELETE_BLOBS targeting checkpoint_blobs: omitting this table left all serialised channel data (messages, tool results, etc.) behind as orphaned rows on every sweep - unbounded storage growth - mirror all three changes in AsyncPostgresStrategy
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