log: demote the four lines that were 90% of debug.log behind /debugrelay

A 13-hour production capture was ~71% "sending: tx", ~16% "Nostr:
discovered .btf peer", ~5% "Relaying wtx", and ~43% of raw lines were
CBlock/CTransaction dumps -- all already under -debug, which operators
run permanently, so -debug was useless as a filter.

The category mechanism gains a verbose tier: "relay" and
"nostrdiscovery" are accepted only with the new /debugrelay flag (which
implies /debug); everything else keeps its current gate. Demoted, with
message text unchanged for anyone grepping it:

  net.h     "sending: tx (N bytes)" (BeginMessage/EndMessage/
            AbortMessage all pick the category from the command, so no
            orphaned "(N bytes)" fragments leak into a plain -debug log)
  main.cpp  "Relaying wtx", "received block:" + CBlock::print, and the
            BitcoinMiner block dump
  nostr.cpp "Nostr: discovered .btf peer" -> "nostrdiscovery"

Pool/worker/payout, [payout], BLOCK ORPHANED/ACCEPTED and share flow
lines are untouched. Because LogPrint dedup keys on category, demoted
lines also keep their burst collapse under /debugrelay.

Closes #35

1 files changed, 18 insertions, 4 deletions

diff --git a/src/net.h b/src/net.h
index 9f3c7e4..1aee973 100644
--- a/src/net.h
+++ b/src/net.h
@@ -802,6 +802,18 @@ public:
 
 
 
+    // "sending: tx (N bytes)" alone was ~71% of a 13-hour production
+    // debug.log (issue #35), so tx sends are demoted to the /debugrelay-gated
+    // "relay" category; every other command's send trace stays on "net".
+    // The line is emitted in pieces across BeginMessage/EndMessage/
+    // AbortMessage, so all three must agree on the category or orphaned
+    // "(N bytes)" fragments would leak into a plain -debug log.
+    // Valid only mid-message (nPushPos != -1).
+    const char* SendLogCategory() const
+    {
+        return strcmp(GetMessageCommand(), "tx") == 0 ? "relay" : "net";
+    }
+
     void BeginMessage(const char* pszCommand)
     {
         EnterCriticalSection(&cs_vSend);
@@ -809,17 +821,19 @@ public:
             AbortMessage();
         nPushPos = vSend.size();
         vSend << CMessageHeader(pszCommand, 0);
-        if (LogAcceptsCategory("net")) printf("sending: %-12s ", pszCommand);
+        if (LogAcceptsCategory(SendLogCategory())) printf("sending: %-12s ", pszCommand);
     }
 
     void AbortMessage()
     {
         if (nPushPos == -1)
             return;
+        // Capture before nPushPos is cleared; GetMessageCommand() needs it.
+        const char* pszCategory = SendLogCategory();
         vSend.resize(nPushPos);
         nPushPos = -1;
         LeaveCriticalSection(&cs_vSend);
-        if (LogAcceptsCategory("net")) printf("(aborted)\n");
+        if (LogAcceptsCategory(pszCategory)) printf("(aborted)\n");
     }
 
     void EndMessage()
@@ -839,10 +853,10 @@ public:
         unsigned int nSize = vSend.size() - nPushPos - sizeof(CMessageHeader);
         memcpy((char*)&vSend[nPushPos] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize));
 
-        if (LogAcceptsCategory("net")) printf("(%d bytes)  ", nSize);
+        if (LogAcceptsCategory(SendLogCategory())) printf("(%d bytes)  ", nSize);
         //for (int i = nPushPos+sizeof(CMessageHeader); i < min(vSend.size(), nPushPos+sizeof(CMessageHeader)+20U); i++)
         //    printf("%02x ", vSend[i] & 0xff);
-        if (LogAcceptsCategory("net")) printf("\n");
+        if (LogAcceptsCategory(SendLogCategory())) printf("\n");
 
         nPushPos = -1;
         LeaveCriticalSection(&cs_vSend);