Native gui: ongoing work, cables and fuses

db/mariadb.sql

@@ -484,3 +484,25 @@ CREATE TABLE signalk (
     FOREIGN KEY fk_signalk_vessel (vid)
         REFERENCES vessel(vid)
 ) ENGINE=InnoDB;
+
+/* Token
+   - Python: secrets.token_hex(8)
+   - PHP: bin2hex(random_bytes(8)) */
+CREATE TABLE recordlock (
+    lock_table varchar(40) NOT NULL,
+    lock_key int(10) NOT NULL,
+    token varchar(16) NOT NULL,
+    userid smallint(6) NOT NULL,
+    created_at timestamp NOT NULL DEFAULT current_timestamp,
+    last_seen timestamp NOT NULL DEFAULT current_timestamp,
+    PRIMARY KEY (lock_table, lock_key),
+    UNIQUE KEY ix_lock_token (token)
+) ENGINE=MEMORY;
+
+/* Use with: UPDATE revision SET changed=CURRENT_TIMESTAMP WHERE revid=? */
+CREATE TABLE revision (
+   revid smallint(6) UNSIGNED NOT NULL,
+   changed timestamp NOT NULL,
+   PRIMARY KEY (revid),
+   INDEX ix_revision_ts (changed) -- for select by timestamp
+) ENGINE=MEMORY;