diff --git a/migrations/schema.sql b/migrations/schema.sql
index a01235621..4d856dc58 100644
--- a/migrations/schema.sql
+++ b/migrations/schema.sql
@@ -159,7 +159,7 @@ CREATE TABLE IF NOT EXISTS backups(
     preserveSecs INTEGER DEFAULT 0,
     appConfigJson TEXT, /* useful for clone and archive */
     targetId VARCHAR(128) NOT NULL,
-    integrityJSON TEXT,
+    integrityJson TEXT, /* { signature } */
     statsJSON TEXT,
 
     FOREIGN KEY(targetId) REFERENCES backupTargets(id),
@@ -314,6 +314,7 @@ CREATE TABLE IF NOT EXISTS backupTargets(
     encryptionJson TEXT,
     format VARCHAR(16) NOT NULL,
     schedule VARCHAR(128),
+    integrityKeyPairJson TEXT, // { publicKey, privateKey }
     main BOOLEAN DEFAULT false, // 'primary' and 'default' are SQL keywords
     creationTime TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,