Postgresql integration

[swetha1654]

Applicable spec:

Overview

Rationale

Juju Events Changes

Module Changes

Library Changes

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated
• The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions]

license-eye has checked 44 files.

Valid	Invalid	Ignored	Fixed
10	4	30	0

Click to see the invalid file list

• hockeypuck_rock/rockcraft.yaml
• lib/charms/data_platform_libs/v0/data_interfaces.py
• src/charm.py
• templates/hockeypuck.conf.tmpl

Use this command to fix any missing license headers

```bash

docker run -it --rm -v $(pwd):/github/workspace apache/skywalking-eyes header fix

</details>

[github-actions]

Suggested change

	name: hockeypuck
	# Copyright 2025 Canonical Ltd.
	# See LICENSE file for licensing details.
	name: hockeypuck

[github-actions]

Suggested change

	# Copyright 2023 Canonical Ltd.
	# Copyright 2025 Canonical Ltd.
	# See LICENSE file for licensing details.
	# Copyright 2023 Canonical Ltd.

[github-actions]

Suggested change

	#!/usr/bin/env python3
	# Copyright 2025 Canonical Ltd.
	# See LICENSE file for licensing details.
	#!/usr/bin/env python3

[github-actions]

[Inclusive naming check] _{reported by reviewdog 🐶}
[warning] blacklist may be insensitive, use denylist, blocklist instead

[github-actions]

license-eye has checked 45 files.

Valid	Invalid	Ignored	Fixed
10	5	30	0

Click to see the invalid file list

• hockeypuck_rock/hockeypuck.conf.tmpl
• hockeypuck_rock/hockeypuck_wrapper.sh
• hockeypuck_rock/rockcraft.yaml
• lib/charms/data_platform_libs/v0/data_interfaces.py
• src/charm.py

Use this command to fix any missing license headers

```bash

docker run -it --rm -v $(pwd):/github/workspace apache/skywalking-eyes header fix

</details>

[github-actions]

Suggested change

	#!/bin/bash
	# Copyright 2025 Canonical Ltd.
	# See LICENSE file for licensing details.
	#!/bin/bash

[github-actions]

Lint checks failed for b2a3fdc

```

/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py:1 at module level:
D100: Missing docstring in public module
/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py:16 in public class HockeypuckCharm:
D400: First line should end with a period (not 'k')
/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py:18 in public method __init__:
D107: Missing docstring in init
/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py:54 in private method _update_layer_and_restart:
D202: No blank lines allowed after function docstring (found 1)
/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py:84 in public method app_environment:
D205: 1 blank line required between summary line and description (found 0)
/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py:84 in public method app_environment:
D400: First line should end with a period (not 's')
/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py:103 in public method fetch_postgres_relation_data:
D209: Multi-line docstring closing quotes should be on a separate line

[github-actions]

Unit tests failed for b2a3fdc

```

============================= test session starts ==============================
platform linux -- Python 3.10.16, pytest-8.3.4, pluggy-1.5.0 -- /home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/.tox/unit/bin/python
cachedir: .tox/unit/.pytest_cache
rootdir: /home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator
configfile: pyproject.toml
collecting ... collected 0 items / 1 error

==================================== ERRORS ====================================
___________________ ERROR collecting tests/unit/test_base.py ___________________
ImportError while importing test module '/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/tests/unit/test_base.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../../_tool/Python/3.10.16/x64/lib/python3.10/importlib/init.py:126: in import_module
return _bootstrap._gcd_import(name[level:], package, level)
tests/unit/test_base.py:14: in
from charm import IsCharmsTemplateCharm
E ImportError: cannot import name 'IsCharmsTemplateCharm' from 'charm' (/home/ubuntu/actions-runner/_work/hockeypuck-k8s-operator/hockeypuck-k8s-operator/src/charm.py)
=========================== short test summary info ============================
ERROR tests/unit/test_base.py
!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
=============================== 1 error in 0.53s ===============================

[github-actions]

Test coverage for b2a3fdc

Name           Stmts   Miss Branch BrPart  Cover   Missing
----------------------------------------------------------
src/charm.py      71     52     16      1    23%   19-27, 30-44, 47, 51, 67-80, 90-100, 111-125, 130-144, 148
----------------------------------------------------------
TOTAL             71     52     16      1    23%

Static code analysis report

Run started:2025-01-15 14:09:47.162602

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 195
  Total lines skipped (#nosec): 0
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):