debug logs (#1472)

_database/sql/migrations_squashed/debug_logs.sql

@@ -0,0 +1,31 @@
+-- noinspection SqlDialectInspectionForFile
+-- noinspection SqlNoDataSourceInspectionForFile
+-- noinspection SqlResolveForFile
+
+CREATE TABLE debug_logs (
+
+  -- Not used for anything except replication.
+  id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
+
+  -- Event token. Not unique — multiple log rows can share the same event.
+  event_token VARCHAR(32) NOT NULL,
+
+  -- The type of debug log entry.
+  debug_log_type VARCHAR(24) NOT NULL,
+
+  -- The user who created the log entry (if any).
+  maybe_creator_user_token VARCHAR(32) DEFAULT NULL,
+
+  -- The log message body.
+  message MEDIUMTEXT NOT NULL,
+
+  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+  -- INDICES --
+  PRIMARY KEY (id),
+  KEY index_event_token (event_token),
+  KEY index_debug_log_type (debug_log_type),
+  KEY index_maybe_creator_user_token (maybe_creator_user_token),
+  KEY index_created_at (created_at)
+
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;