Test wal sender feedback - #180
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…t buffering Change the Put RPC from client-streaming to bidi-streaming so the Klio server acknowledges each WAL block as it is written, instead of only returning a single result when the stream closes. The gRPC client and walserver upload handler are updated accordingly, and the WAL receiver now runs two goroutines: one pumping PostgreSQL WAL data to the server, the other reading per-block feedback and turning it into standby status updates for PostgreSQL. This makes the in-memory WAL buffer, its periodic flush timer and the related config (buffer_size, flush_timeout_ms, standby_message_timeout_seconds, SetDefaults) unnecessary, since blocks are now sent to the server as they arrive and confirmed via the server's own feedback rather than a client-side timer. Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enterprisedb.com>
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