# 1. Filter for valid JSON and 2026+ timestamps
# Using the same field $4 logic as OMB
grep '^{"Timestamp":' datafile | awk -F'[:,"}]' '$4 >= 1735689600' > datafile.NEW

# 2. Archive everything older than Jan 1, 2026
grep '^{"Timestamp":' datafile | awk -F'[:,"}]' '$4 < 1735689600' > OLDdatafile

# 3. Sanity Check
ls -lh datafile datafile.NEW OLDdatafile
tail -n 5 datafile.NEW