Added history to nodes

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+bin/
+build/
+develop-eggs/
+dist/
+eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.cache
+nosetests.xml
+coverage.xml
+
+# Translations
+*.mo
+
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# Rope
+.ropeproject
+
+# Django stuff:
+*.log
+*.pot
+
+# Sphinx documentation
+docs/_build/
+
+# Vim
+*.swp
+
+# Virtualenv
+tg2env/
+
+# cache
+pboard/data/

doc/database/pod-upgrade-0.2.0_to_0.3.0.sql

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+-- move table
+ALTER TABLE pod_nodes RENAME TO pod_nodes_history;
+
+-- add uuid index
+-- drop primary key
+-- new primary key
+CREATE SEQUENCE pod_nodes_version_id_sequence;
+ALTER TABLE pod_nodes_history
+    DROP CONSTRAINT pod_nodes_pk CASCADE,
+    ADD COLUMN version_id INTEGER PRIMARY KEY DEFAULT nextval('pod_nodes_version_id_sequence');
+
+-- create view
+CREATE OR REPLACE VIEW pod_nodes AS
+    SELECT DISTINCT ON (node_id) node_id, parent_id, node_order, node_type, created_at, updated_at, 
+        data_label, data_content, data_datetime, node_status, data_reminder_datetime, 
+        data_file_name, data_file_content, data_file_mime_type, parent_tree_path, 
+        node_depth, owner_id
+    FROM pod_nodes_history
+    ORDER BY node_id, updated_at DESC;
+
+CREATE OR REPLACE RULE pod_insert_new_node AS ON INSERT
+TO pod_nodes
+DO INSTEAD INSERT INTO pod_nodes_history (node_id, parent_id, node_order, node_type, created_at, updated_at, 
+       data_label, data_content, data_datetime, node_status, data_reminder_datetime, 
+       data_file_name, data_file_content, data_file_mime_type, parent_tree_path, 
+       node_depth, owner_id, version_id) VALUES (nextval('pod_nodes__node_id__sequence'), NEW.parent_id, NEW.node_order, NEW.node_type, NEW.created_at, NEW.updated_at, NEW.data_label, NEW.data_content, NEW.data_datetime, NEW.node_status, NEW.data_reminder_datetime, NEW.data_file_name, NEW.data_file_content, NEW.data_file_mime_type, NEW.parent_tree_path, NEW.node_depth, NEW.owner_id, nextval('pod_nodes_version_id_sequence'))
+RETURNING node_id, parent_id, node_order, node_type, created_at, updated_at, 
+       data_label, data_content, data_datetime, node_status, data_reminder_datetime, 
+       data_file_name, data_file_content, data_file_mime_type, parent_tree_path, 
+       node_depth, owner_id;
+
+CREATE OR REPLACE FUNCTION pod_update_node() RETURNS trigger AS $$
+BEGIN
+INSERT INTO pod_nodes_history (node_id, parent_id, node_order, node_type, created_at, updated_at, 
+       data_label, data_content, data_datetime, node_status, data_reminder_datetime, 
+       data_file_name, data_file_content, data_file_mime_type, parent_tree_path, 
+       node_depth, owner_id, version_id) VALUES (NEW.node_id, NEW.parent_id, NEW.node_order, NEW.node_type, NEW.created_at, NEW.updated_at, NEW.data_label, NEW.data_content, NEW.data_datetime, NEW.node_status, NEW.data_reminder_datetime, NEW.data_file_name, NEW.data_file_content, NEW.data_file_mime_type, NEW.parent_tree_path, NEW.node_depth, NEW.owner_id, nextval('pod_nodes_version_id_sequence'));
+return new;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER pod_update_node_tg INSTEAD OF UPDATE ON pod_nodes FOR EACH ROW EXECUTE PROCEDURE pod_update_node();