add a clear! method to litekd to clear all data

lib/litestack/litekd.rb

@@ -26,6 +26,13 @@ def self.configure(options = {})
     @@options = options
   end
 
+  def self.clear!
+    connection.transaction(:immediate) do
+      connection.clear_all_scalars
+      connection.clear_all_composites
+    end
+  end
+
   # scalars
   def self.string(key, **args) = Scalar.new(key, typed: :string, **args)
   def self.integer(key, **args) = Scalar.new(key, typed: :integer, **args)

lib/litestack/sql/litekd.sql.yml

@@ -21,6 +21,13 @@ schema:
       CREATE INDEX direct_value_index ON composites(key, value) 
       
 stmts:
+
+  clear_all_scalars: >
+    DELETE FROM scalars;
+    
+  clear_all_composites: >
+    DELETE FROM composites;
+
   write_scalar_value: >
     INSERT OR REPLACE INTO scalars(key, value, expires_in)
     VALUES (:key, :value, unixepoch('subsec') + :expires_in);

test/test_litekd.rb

@@ -34,6 +34,7 @@ def generate_names_key
 class TestLitekd < Minitest::Test
 
   def setup
+    Kredis.clear!
   end
 
   def test_string