extract select by signer from KeychainProvider

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

@@ -3,6 +3,10 @@ CREATE TABLE IF NOT EXISTS keyrings_public (
     key_ring_data BLOB NULL
 );
 
+selectAllMasterKeyIds:
+SELECT master_key_id
+    FROM keyrings_public;
+
 selectByMasterKeyId:
 SELECT *
     FROM keyrings_public

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

@@ -0,0 +1,7 @@
+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
+);

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

@@ -46,4 +46,9 @@ SELECT *
 selectSecretKeyType:
 SELECT has_secret
     FROM keys
-    WHERE key_id = ?;
+    WHERE key_id = ?;
+
+-- TODO move to KeySignatures.sq
+selectMasterKeyIdsBySigner:
+SELECT master_key_id
+    FROM key_signatures WHERE signer_key_id IN ?;