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README.md

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+# Compress Synapse State Tables
+
+An experimental tool that reads in the rows from `state_groups_state` and
+`state_group_edges` tables for a particular room and calculates the changes that
+could be made that (hopefully) will signifcantly reduce the number of rows.
+
+This tool currently *does not* write to the database in any way, so should be
+safe to run.
+
+
+## Example
+
+```
+$ cargo run --release -- -p "postgresql://localhost/synapse" -r '!some_room:example.com'
+   Compiling rust-synapse-compress-state v0.1.0 (file:///home/erikj/git/rust-synapse-compress-state)
+    Finished release [optimized] target(s) in 2.39s
+     Running `target/release/rust-synapse-compress-state -p 'postgresql://localhost/synapse' -r '!some_room:example.com'`
+Missing 11 state groups
+Number of entries: 25694
+Number of rows: 356650
+Number of rows compressed: 41068
+New state map matches old one
+```