Add dialects

Signed-off-by: m.nabokikh <maksim.nabokikh@flant.com>

storage/ent/schema/dialects.go

@@ -0,0 +1,21 @@
+package schema
+
+import (
+	"entgo.io/ent/dialect"
+)
+
+var textSchema = map[string]string{
+	dialect.Postgres: "text",
+	dialect.SQLite:   "text",
+	// MySQL doesn't support indices on text fields w/o
+	// specifying key length. Use varchar instead (767 byte
+	// is the max key length for InnoDB with 4k pages).
+	// For compound indexes (with two keys) even less.
+	dialect.MySQL: "varchar(384)",
+}
+
+var timeSchema = map[string]string{
+	dialect.Postgres: "timestamptz",
+	dialect.SQLite:   "timestamp",
+	dialect.MySQL:    "datetime(3)",
+}