Add 'tool/mastodonwch/README.md'

tool/mastodonwch/README.md

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+### Shared on Mastodon
+
+Who is sharing most Cloudflare links to other people? Please stop it already.
+
+
+### Database
+
+- toot_cfsaid: Tweet URL which CF link was observed
+```
+id	varchar(40) UNIQUE
+who	varchar(80) INDEX
+url	varchar(200) INDEX
+ym	int(6) INDEX
+```
+
+- toot_notcf_fqdn: Unknown FQDN which was not listed as Cloudflare
+```
+fqdn	varchar(200) UNIQUE
+dl	int(1) INDEX
+```
+
+- toot_scanned: To make sure not to analyze same tweet again
+```
+id	varchar(40) UNIQUE
+who	varchar(80) INDEX
+iscf	int(1) INDEX
+ym	int(6) INDEX
+```
+
+- toot_sharefqdn: Just for counting FQDN
+```
+id	varchar(40) UNIQUE
+fqdn	varchar(200) INDEX
+ym	int(6) INDEX
+```