clean up KeySignatures.sq

OpenKeychain/src/main/sqldelight/org/sufficientlysecure/keychain/Certs.sq

@@ -1,7 +1,6 @@
 import java.lang.Integer;
 import org.sufficientlysecure.keychain.pgp.CanonicalizedKeyRing.VerificationStatus;
 
--- TODO implement. this is only here for reference in SQLDelight
 CREATE TABLE IF NOT EXISTS certs(
     master_key_id INTEGER NOT NULL,
     rank INTEGER NOT NULL,

OpenKeychain/src/main/sqldelight/org/sufficientlysecure/keychain/KeySignatures.sq

@@ -2,6 +2,9 @@ CREATE TABLE IF NOT EXISTS key_signatures (
     master_key_id INTEGER NOT NULL,
     signer_key_id INTEGER NOT NULL,
     PRIMARY KEY(master_key_id, signer_key_id),
-    FOREIGN KEY(master_key_id) REFERENCES
-    keyrings_public(master_key_id) ON DELETE CASCADE
+    FOREIGN KEY(master_key_id) REFERENCES keyrings_public(master_key_id) ON DELETE CASCADE
 );
+
+selectMasterKeyIdsBySigner:
+SELECT master_key_id
+   FROM key_signatures WHERE signer_key_id IN ?;

OpenKeychain/src/main/sqldelight/org/sufficientlysecure/keychain/Keys.sq

@@ -94,8 +94,3 @@ SELECT key_id
     FROM keys
     WHERE is_revoked = 0 AND is_secure = 1 AND has_secret > 1 AND ( expiry IS NULL OR expiry >= date('now') )
         AND can_authenticate = 1 AND master_key_id = ?;
-
--- TODO move to KeySignatures.sq
-selectMasterKeyIdsBySigner:
-SELECT master_key_id
-   FROM key_signatures WHERE signer_key_id IN ?;