Add parsing of schema indexes

pkg/schema/table.go

@@ -32,5 +32,15 @@ type Table struct {
 	TypeName   string
 }
 
-// Schema is a container for a bunch of Tables, indexed by table name.
-type Schema map[string]Table
+type Index struct {
+	Name      string `db:"index_name"`
+	TableName string `db:"table_name"`
+	Columns   []string
+	IsUnique  bool `db:"is_unique"`
+	// TODO: `where ...` for partial indexes
+}
+
+type Schema struct {
+	Tables  map[string]Table
+	Indexes map[string]Index
+}