docs: Improved pipeline or tests docs

.github/workflows/cd-base.yml

@@ -1,3 +1,19 @@
+# ===============================================
+# CI/CD Pipeline: Pull GHCR image -> Re-tag -> Push to DockerHub -> Deploy with Terraform
+# ===============================================
+# Description:
+# This workflow takes a Docker image from GHCR (GitHub Container Registry) generated by a PR or push,
+# retags it with the DockerHub username, pushes it to DockerHub, and then deploys the latest image
+# to Cloud Run using Terraform. It also handles initial database table creation if necessary.
+#
+# Inputs:
+#   - deployment_env: Deployment environment (e.g., staging, production)
+#   - image_uri: URI of the image in GHCR (e.g., ghcr.io/org/repo:tag)
+#
+# Outputs:
+#   - dockerhub_image: URI of the retagged image pushed to DockerHub
+# ===============================================
+
 on:
   workflow_call:
     inputs:
@@ -9,6 +25,9 @@ on:
         type: string
 
 jobs:
+  # -----------------------------------------------
+  # Job: Pull image from GHCR, retag, and push to DockerHub
+  # -----------------------------------------------
   pull-tag-push: 
     runs-on: ubuntu-latest
     outputs:
@@ -48,8 +67,11 @@ jobs:
 
           docker push ${DOCKERHUB_IMAGE}
 
-          echo "image_uri=${PUBLIC_IMAGE}" >> $GITHUB_OUTPUT
+          echo "image_uri=${PUBLIC_IMAGE}" >> $GITHUB_OUTPUT # <-- output this way given that github actions will censor secrets
 
+  # -----------------------------------------------
+  # Job: Deploy application to GCP using Terraform
+  # -----------------------------------------------
   deploy:
     needs: pull-tag-push
     runs-on: ubuntu-latest

.github/workflows/cd-stg.yml

@@ -1,4 +1,15 @@
-# CD pipeline for staging environment runs when PR gets merged with main branch
+# =====================================================
+# CD Pipeline: Staging Environment
+# =====================================================
+# Description:
+# This workflow deploys the latest register-ticket-api image
+# to the staging environment whenever a PR is merged into main
+# or when triggered manually via workflow_dispatch.
+#
+# Jobs:
+#   - deploy-to-stg: Deploys the application using the reusable cd-base workflow
+#   - promote-to-stg-passed: Tags the image as stg-passed after successful deployment
+# =====================================================
 
 name: CD pipeline for staging environment
 

.github/workflows/ci-dev-branches.yml

@@ -1,4 +1,21 @@
-# Static Code Analysis, runs when push to feature/**, feat/**, fix/** branches.
+# ===============================================
+# CI Workflow: Dev Branch Validations
+# ===============================================
+# Description:
+# This workflow runs static code analysis on development branches
+# to enforce code quality and style before merging into main.
+#
+# Triggers:
+#   - Push to any branch matching feature/**, feat/**, or fix/**
+#
+# Jobs:
+#   - static-code-analysis: Delegates to the shared workflow
+#     ./.github/workflows/static-code-analysis.yml
+#
+# Inputs:
+#   - coverage_artifact: Boolean flag to enable/disable coverage artifact
+#     generation. Here set to false.
+# ===============================================
 
 name: Dev branch validations
 

.github/workflows/integration-tests.yml

@@ -1,3 +1,24 @@
+# =====================================================
+# CI/CD Workflow: Run Integration Tests
+# =====================================================
+# Description:
+# This workflow executes integration tests for the project.
+# It can run in different deployment environments (local, staging, production)
+# and conditionally starts/stops local services using Docker Compose.
+#
+# Triggered via:
+#   - workflow_call (called from other workflows)
+#
+# Inputs:
+#   deployment_env: Deployment environment (e.g., local, staging, prod)
+#
+# Jobs:
+#   - run-integration-tests:
+#       Checks out code, installs dependencies, loads environment variables,
+#       optionally spins up Docker Compose services for local testing,
+#       executes integration tests, and cleans up resources.
+# =====================================================
+
 name: Run integration tests
 on:
   workflow_call:

.github/workflows/pr-validations.yml

@@ -1,4 +1,25 @@
-# Static Code Analysis and test validation workflow. Runs only on pull requests targeting the main branch.
+# =====================================================
+# CI/CD Workflow: Pull Request Validations
+# =====================================================
+# Description:
+# This workflow runs validations on pull requests targeting the main branch.
+# It includes static code analysis, (optionally SonarQube analysis), integration tests,
+# and building & pushing Docker images to GitHub Container Registry (GHCR).
+#
+# Triggered via:
+#   - pull_request events on the main branch
+#
+# Jobs:
+#   - static-code-analysis:
+#       Runs static code checks and optionally generates coverage artifacts.
+#
+#   - run-integration-tests:
+#       Executes integration tests in a specified environment. Depends on static code analysis.
+#
+#   - build-and-push-register-ticket-api:
+#       Builds the Docker image for the register-ticket-api service and pushes it to GHCR.
+#       Depends on integration tests to ensure only tested code is pushed.
+# =====================================================
 
 name: Pull Requests Validations
 

.github/workflows/static-code-analysis.yml

@@ -1,4 +1,23 @@
-# Static Code Analysis, called when PR to main or push to feature/**, feat/**, fix/** branches.
+# =====================================================
+# CI Workflow: Static Code Analysis
+# =====================================================
+# Description:
+# This workflow performs static code analysis, lints, and unit tests
+# for Python projects. It supports generating coverage reports optionally.
+#
+# Triggered via:
+#   - workflow_call: Can be invoked by other workflows
+#
+# Inputs:
+#   - coverage_artifact (boolean, required): 
+#       If true, generates coverage reports and uploads them as artifacts.
+#       If false, runs tests with console-only coverage output.
+#
+# Jobs:
+#   - static-code-analysis:
+#       Runs pre-commit checks, installs dependencies, executes unit tests,
+#       and optionally uploads coverage reports.
+# =====================================================
 
 name: Static Code Analysis
 on: 

.github/workflows/teardown.yml

@@ -1,3 +1,23 @@
+# =====================================================
+# CI/CD Workflow: PANIC - Destroy Infrastructure
+# =====================================================
+# Description:
+# This workflow is used to destroy all infrastructure for a given environment.
+# It is intended for emergency or complete teardown scenarios.
+#
+# Triggered via:
+#   - workflow_dispatch: Manual trigger from GitHub UI
+#
+# Inputs:
+#   - deployment_env (choice, required): The target environment to destroy. Options: stg, prd
+#   - confirmation (string, required): Must be exactly "DESTROY" to confirm execution.
+#
+# Jobs:
+#   - destroy-infrastructure:
+#       Validates the confirmation input, initializes Terraform, selects the
+#       appropriate workspace, and destroys all resources.
+# =====================================================
+
 name: PANIC - destroy infrastructure
 
 on:

tests/integration/test_tickets_registration.py

@@ -1,3 +1,7 @@
+"""
+Integration tests for the ticket registration API and database flow.
+"""
+
 from typing import Any
 
 import requests
@@ -12,7 +16,17 @@ def test_register_ticket_flow(
     base_url: str, db_connection: connection, test_username: str = "spuertaf"
 ) -> None:
     """
-    Tests whole ticket registration flow works as expected.
+    Test the full ticket registration flow for a user.
+
+    Sends a POST request to register a ticket for the specified user, then
+    verifies that the ticket is correctly stored in the database with
+    expected values.
+
+    Args:
+        base_url (str): Base URL of the ticket registration API.
+        db_connection (connection): Active PostgreSQL database connection.
+        test_username (str, optional): Username for which the ticket is registered.
+            Defaults to "spuertaf".
     """
     headers: dict[str, str] = {"Content-Type": "application/json"}
     payload: dict[str, str] = {"seat": "A12", "gate": "G1"}
@@ -59,6 +73,17 @@ def test_register_ticket_fails_when_already_registered(
     base_url: str,
     test_username: str = "juanperez",  # different user so tests don't collide
 ) -> None:
+    """
+    Test that registering the same ticket twice fails.
+
+    Sends a POST request to register a ticket for the user, then attempts
+    to register the same ticket again and expects an error.
+
+    Args:
+        base_url (str): Base URL of the ticket registration API.
+        test_username (str, optional): Username for which the ticket is registered.
+            Defaults to "juanperez".
+    """
     headers: dict[str, str] = {"Content-Type": "application/json"}
     payload: dict[str, str] = {
         "seat": "B05",
@@ -78,6 +103,17 @@ def test_register_ticket_fails_when_already_registered(
 
 
 def test_invalid_ticket_registration_error(base_url: str, test_username: str = "spuertaf") -> None:
+    """
+    Test that registering a ticket with invalid data returns an error.
+
+    Sends a POST request with invalid seat/gate values and expects the API
+    to return an error code.
+
+    Args:
+        base_url (str): Base URL of the ticket registration API.
+        test_username (str, optional): Username for which the ticket is registered.
+            Defaults to "spuertaf".
+    """
     headers: dict[str, str] = {"Content-Type": "application/json"}
     payload: dict[str, str] = {"seat": "B05", "gate": "G12"}
     endpoint: str = f"/api/users/{test_username}/tickets"