Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/db/migrations/mysql/000022_create_sessions.up.sql

@@ -0,0 +1,116 @@
+CREATE TABLE IF NOT EXISTS Sessions (
+    Id varchar(26) PRIMARY KEY,
+    Token varchar(26) DEFAULT NULL,
+    CreateAt bigint(20) DEFAULT NULL,
+    ExpiresAt bigint(20) DEFAULT NULL,
+    LastActivityAt bigint(20) DEFAULT NULL,
+    UserId varchar(26) DEFAULT NULL,
+    DeviceId text,
+    Roles varchar(64) DEFAULT NULL,
+    IsOAuth tinyint(1),
+    Props text
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Sessions'
+        AND table_schema = DATABASE()
+        AND column_name = 'ExpiredNotify'
+    ) > 0,
+    'SELECT 1',
+    'ALTER TABLE Sessions ADD ExpiredNotify tinyint(1) DEFAULT NULL;'
+));
+
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Sessions'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_sessions_user_id'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_sessions_user_id ON Sessions(UserId);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Sessions'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_sessions_token'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_sessions_token ON Sessions(Token);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Sessions'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_sessions_expires_at'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_sessions_expires_at ON Sessions(ExpiresAt);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Sessions'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_sessions_create_at'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_sessions_create_at ON Sessions(CreateAt);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Sessions'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_sessions_last_activity_at'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_sessions_last_activity_at ON Sessions(LastActivityAt);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+
+CREATE PROCEDURE Migrate_If_Version_Below_5120 ()
+BEGIN
+DECLARE
+	CURRENT_DB_VERSION TEXT;
+	SELECT
+		Value
+	FROM
+		Systems
+	WHERE
+		Name = 'Version' INTO CURRENT_DB_VERSION;
+	IF(INET_ATON(CURRENT_DB_VERSION) < INET_ATON('5.12.0')) THEN
+		DELETE FROM Sessions where ExpiresAt > 3000000000000;
+	END IF;
+END;
+	CALL Migrate_If_Version_Below_5120 ();
+	DROP PROCEDURE IF EXISTS Migrate_If_Version_Below_5120;