the actual schema change (log_message.worker_id DEFAULT NULL)

sql/tables.mysql

@@ -485,7 +485,7 @@ CREATE TABLE worker (
 CREATE TABLE log_message (
     log_message_id          INTEGER     NOT NULL PRIMARY KEY AUTO_INCREMENT,
     job_id                  INTEGER              DEFAULT NULL,
-    worker_id               INTEGER     NOT NULL,
+    worker_id               INTEGER              DEFAULT NULL,
     time                    TIMESTAMP   NOT NULL DEFAULT CURRENT_TIMESTAMP,
     retry                   INTEGER              DEFAULT NULL,
     status                  ENUM('UNKNOWN','SPECIALIZATION','COMPILATION','READY','PRE_CLEANUP','FETCH_INPUT','RUN','WRITE_OUTPUT','POST_CLEANUP','PASSED_ON') DEFAULT 'UNKNOWN',

sql/tables.pgsql

@@ -487,7 +487,7 @@ CREATE INDEX ON worker (analysis_id, status);
 CREATE TABLE log_message (
     log_message_id          SERIAL PRIMARY KEY,
     job_id                  INTEGER              DEFAULT NULL,
-    worker_id               INTEGER     NOT NULL,
+    worker_id               INTEGER              DEFAULT NULL,
     time                    TIMESTAMP   NOT NULL DEFAULT CURRENT_TIMESTAMP,
     retry                   INTEGER              DEFAULT NULL,
     status                  jw_status            DEFAULT 'UNKNOWN',

sql/tables.sqlite

@@ -476,7 +476,7 @@ CREATE        INDEX worker_analysis_id_status_idx ON worker (analysis_id, status
 CREATE TABLE log_message (
     log_message_id          INTEGER     NOT NULL PRIMARY KEY AUTOINCREMENT,
     job_id                  INTEGER              DEFAULT NULL,
-    worker_id               INTEGER     NOT NULL,
+    worker_id               INTEGER              DEFAULT NULL,
     time                    TIMESTAMP   NOT NULL DEFAULT CURRENT_TIMESTAMP,
     retry                   INTEGER              DEFAULT NULL,
     status                  TEXT        NOT NULL DEFAULT 'UNKNOWN', /* enum('UNKNOWN','SPECIALIZATION','COMPILATION','READY','PRE_CLEANUP','FETCH_INPUT','RUN','WRITE_OUTPUT','POST_CLEANUP','PASSED_ON') DEFAULT 'UNKNOWN' */