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/000018_create_schemes.up.sql

@@ -0,0 +1,121 @@
+CREATE TABLE IF NOT EXISTS Schemes (
+    Id varchar(26) NOT NULL,
+    Name varchar(64) DEFAULT NULL,
+    DisplayName varchar(128) DEFAULT NULL,
+    Description text,
+    CreateAt bigint(20) DEFAULT NULL,
+    UpdateAt bigint(20) DEFAULT NULL,
+    DeleteAt bigint(20) DEFAULT NULL,
+    Scope varchar(32) DEFAULT NULL,
+    DefaultTeamAdminRole varchar(64) DEFAULT NULL,
+    DefaultTeamUserRole varchar(64) DEFAULT NULL,
+    DefaultChannelAdminRole varchar(64) DEFAULT NULL,
+    DefaultChannelUserRole varchar(64) DEFAULT NULL,
+    PRIMARY KEY (Id),
+    UNIQUE KEY Name (Name)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Schemes'
+        AND table_schema = DATABASE()
+        AND column_name = 'DefaultTeamGuestRole'
+    ) > 0,
+    'SELECT 1',
+    'ALTER TABLE Schemes ADD DefaultTeamGuestRole varchar(64);'
+));
+
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Schemes'
+        AND table_schema = DATABASE()
+        AND column_name = 'DefaultChannelGuestRole'
+    ) > 0,
+    'SELECT 1',
+    'ALTER TABLE Schemes ADD DefaultChannelGuestRole varchar(64);'
+));
+
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Schemes'
+        AND table_schema = DATABASE()
+        AND column_name = 'DefaultTeamGuestRole'
+    ) > 0,
+    'ALTER TABLE Schemes MODIFY DefaultTeamGuestRole varchar(64);',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Schemes'
+        AND table_schema = DATABASE()
+        AND column_name = 'DefaultChannelGuestRole'
+    ) > 0,
+    'ALTER TABLE Schemes MODIFY DefaultChannelGuestRole varchar(64);',
+    'SELECT 1'
+));
+
+PREPARE alterIfExists FROM @preparedStatement;
+EXECUTE alterIfExists;
+DEALLOCATE PREPARE alterIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Schemes'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_schemes_channel_guest_role'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_schemes_channel_guest_role ON Schemes(DefaultChannelGuestRole);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Schemes'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_schemes_channel_user_role'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_schemes_channel_user_role ON Schemes(DefaultChannelUserRole);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Schemes'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_schemes_channel_admin_role'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_schemes_channel_admin_role ON Schemes(DefaultChannelAdminRole);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;