chore: tweak cli output and readme

License: MIT
Signed-off-by: Oli Evans <[email protected]>

README.md

@@ -77,6 +77,17 @@ Assuming we have to write 1 new record for every source record
 - 858 million / 3 items per WCU = 286 million WCUs
 - 286 * $1.25 per million = **$357.5 total write cost**
 
+### Throughput
+
+Scanning ~1M rows and checking if they exist = 100min = 10k per min
+859 batches = 1,718hr = 71 days
+
+1 batch = 800MB down 300MB up (~2MB/s down at 10 workers)
+
+max sst "job" length = 8hrs
+
+~10k rows per minute, 15mins lambda runtime.
+
 
 ### References
 

cli.js

@@ -11,7 +11,7 @@ const segment = parseInt(process.argv.at(5) ?? exit('plz pass segment'))
 const client = new DynamoDBClient()
 
 const spinner = ora({
-  text: `Migrating: ${src} -> ${dst}`
+  text: `Scanning: ${src} -> ${dst} (migrate-block-index-${totalSegments}-${segment})`
 }).start()
 
 // await migrate(src, dst, client, spinner)