Add missing migration from 602144100.

migrations/86-tweet-relationships.sql

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+-- Remove surrogate key, and use tweet ID instead. Make reply_to a foreign key,
+-- and rename it to conform to our conventions.
+ALTER TABLE customercare_tweet DROP id, ADD PRIMARY KEY (tweet_id);
+ALTER TABLE customercare_tweet CHANGE reply_to reply_to_id bigint;
+ALTER TABLE customercare_tweet ADD CONSTRAINT reply_to_id_refs_tweet_id_47b7f44d FOREIGN KEY (reply_to_id) REFERENCES customercare_tweet (tweet_id);
+
+-- Drop old tweet_id index, now redundant with pkey:
+ALTER TABLE customercare_tweet DROP KEY tweet_id;