--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/python/cc/lmh/shrink.py	Mon Dec 22 22:18:16 2025 +0000
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+'''Shrink cdb_input-style files after the fact
+   Each record is encoded as +klen,dlen:key->data
+
+   Usage: shrink.py file.cdb_in cdate_prefix | sponge file.cdb_in
+'''
+import sys, io
+
+fn = sys.argv.pop(1)
+dp = sys.argv.pop(1)
+dpl = len(dp)
+saved = 0
+buf = io.BytesIO(bytearray(4))
+
+with open(fn) as f:
+  for l in f:
+    sys.stdout.write(l)
+    sys.stdout.flush()
+    (bb,od,oe) = l.rstrip().split(':',2)
+    (os1,os2)=bb[1:].split(',')
+    kl=int(os1)
+    ll=int(os2)
+    for i in range(dpl):
+      if od[i] != dp[i]:
+        break
+    if i > 0:
+      nd = od[i-1:]
+    else:
+      nd = od
+    print(od,nd)
+    ol = oe[-ll:]
+    nli = int(ol)
+    nl = int.to_bytes(nli,4)
+    print("+%s,%s"%(kl-(len(od)-len(nd)),4),nd,oe[:-ll],sep=':',end='')
+    buf.seek(0)
+    buf.write(nl)
+    sys.stdout.buffer.write(buf.getbuffer())
+    sys.stdout.buffer.write(b'\n')
+    exit()