Replace go-migrate with morph (#19116)

db/migrations/postgres/000049_create_channels.up.sql

@@ -0,0 +1,76 @@
+CREATE TABLE IF NOT EXISTS channels (
+    id varchar(26) PRIMARY KEY,
+    createat bigint,
+    updateat bigint,
+    deleteat bigint,
+    teamid varchar(26),
+    type varchar(1),
+    displayname varchar(64),
+    name varchar(64),
+    header varchar(1024),
+    purpose varchar(128),
+    lastpostat bigint,
+    totalmsgcount bigint,
+    extraupdateat bigint,
+    creatorid varchar(26),
+    UNIQUE(name, teamid)
+);
+
+CREATE INDEX IF NOT EXISTS idx_channels_displayname ON channels (displayname);
+CREATE INDEX IF NOT EXISTS idx_channels_txt ON channels (name, displayname);
+CREATE INDEX IF NOT EXISTS idx_channels_displayname_lower ON channels (lower(displayname));
+CREATE INDEX IF NOT EXISTS idx_channels_name_lower ON channels (lower(name));
+CREATE INDEX IF NOT EXISTS idx_channels_name ON channels (name);
+CREATE INDEX IF NOT EXISTS idx_channels_update_at ON channels (updateat);
+CREATE INDEX IF NOT EXISTS idx_channels_team_id ON channels (teamid);
+CREATE INDEX IF NOT EXISTS idx_channels_delete_at ON channels (deleteat);
+CREATE INDEX IF NOT EXISTS idx_channels_create_at ON channels (createat);
+CREATE INDEX IF NOT EXISTS idx_channel_search_txt ON channels using gin (to_tsvector('english'::regconfig, (((((name)::text || ' '::text) || (displayname)::text) || ' '::text) || (purpose)::text)));
+
+DO $$
+<<modify_column_type_if_type_is_different>>
+DECLARE
+    col_exist_and_type_different boolean := false;
+BEGIN
+    SELECT count(*) != 0 INTO col_exist_and_type_different
+    FROM information_schema.columns
+    WHERE table_name = 'channels'
+    AND column_name = 'purpose'
+    AND data_type = 'character varying'
+    AND NOT character_maximum_length = 250;
+
+    IF col_exist_and_type_different THEN
+        ALTER TABLE channels ALTER COLUMN purpose TYPE varchar(250);
+    END IF;
+END modify_column_type_if_type_is_different $$;
+
+DROP INDEX IF EXISTS idx_channels_displayname;
+
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS schemeid varchar(26);
+
+DROP INDEX IF EXISTS idx_channels_txt;
+
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS groupconstrained boolean;
+
+DO $$
+<<modify_column_type_if_type_is_different>>
+DECLARE
+    col_exist_and_type_different boolean := false;
+BEGIN
+    SELECT count(*) != 0 INTO col_exist_and_type_different
+    FROM information_schema.columns
+    WHERE table_name = 'channels'
+    AND column_name = 'groupconstrained'
+    AND NOT data_type = 'boolean';
+
+    IF col_exist_and_type_different THEN
+        ALTER TABLE channels ALTER COLUMN groupconstrained TYPE boolean;
+    END IF;
+END modify_column_type_if_type_is_different $$;
+
+CREATE INDEX IF NOT EXISTS idx_channels_scheme_id ON channels (schemeid);
+
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS shared boolean;
+
+DROP INDEX IF EXISTS idx_channels_name;
+