I have refactored the SQL Explorer functionality into its own blueprint (routes/sql_explorer.py) with a /sql URL prefix. This involved moving the relevant routes from app.py, registering the new blueprint, removing the old routes, updating url_for calls in the templates, and documenting the change in the changelog.

Here is a conventional commit message summarizing the changes:

```
feat: Refactor SQL Explorer into blueprint

- Moved SQL Explorer routes (view explorer, save/load/execute/delete queries, view schema, plot queries) from `app.py` into a new blueprint at `routes/sql_explorer.py`.
- Added `/sql` URL prefix to the blueprint.
- Registered the new `sql_explorer_bp` blueprint in `app.py`.
- Removed the original SQL Explorer route definitions from `app.py`.
- Updated `url_for` calls in relevant templates (`sql_explorer.html`, `partials/sql_explorer/sql_query.html`, `base.html`) to reference the new blueprint endpoints (e.g., `sql_explorer.sql_explorer`).
- Updated `templates/changelog/changelog.html` to document this refactoring.
```

app.py

@@ -10,6 +10,7 @@ from routes.changelog import changelog_bp
 from routes.calendar import calendar_bp # Import the new calendar blueprint
 from routes.notes import notes_bp # Import the new notes blueprint
 from routes.workout import workout_bp # Import the new workout blueprint
+from routes.sql_explorer import sql_explorer_bp # Import the new SQL explorer blueprint
 from extensions import db
 from utils import convert_str_to_date, generate_plot
 from flask_htmx import HTMX
@@ -40,6 +41,7 @@ app.register_blueprint(changelog_bp, url_prefix='/changelog')
 app.register_blueprint(calendar_bp) # Register the calendar blueprint
 app.register_blueprint(notes_bp) # Register the notes blueprint
 app.register_blueprint(workout_bp) # Register the workout blueprint
+app.register_blueprint(sql_explorer_bp) # Register the SQL explorer blueprint (prefix defined in blueprint file)
 
 @app.after_request
 def response_minify(response):
@@ -306,78 +308,6 @@ def delete_exercise(exercise_id):
     db.exercises.delete_exercise(exercise_id)
     return ""
 
-@app.route("/sql_explorer", methods=['GET'])
-def sql_explorer():
-    saved_queries = db.sql_explorer.list_saved_queries()
-    if htmx:
-        return render_block(app.jinja_env, 'sql_explorer.html', 'content', saved_queries=saved_queries)
-    return render_template('sql_explorer.html', saved_queries=saved_queries)
-
-@app.route("/sql_query", methods=['POST'])
-def sql_query():
-    query = request.form.get('query')
-    title = request.form.get('title')
-
-    error = db.sql_explorer.save_query(title, query)
-    saved_queries = db.sql_explorer.list_saved_queries()
-    return render_template('partials/sql_explorer/sql_query.html',
-        title=title, 
-        query=query, 
-        error=error,
-        saved_queries=saved_queries)
-
-@app.route("/sql_query/execute", methods=['POST'])
-def execute_sql_query():
-    query = request.form.get('query')
-
-    (results, columns, error) = db.sql_explorer.execute_sql(query)
-    return render_template('partials/sql_explorer/results.html', 
-            results=results, 
-            columns=columns, 
-            error=error)
-
-@app.route('/load_sql_query/<int:query_id>', methods=['GET'])
-def load_sql_query(query_id):
-    (title, query) = db.sql_explorer.get_saved_query(query_id)
-    saved_queries = db.sql_explorer.list_saved_queries()
-    return render_template('partials/sql_explorer/sql_query.html',
-        title=title, 
-        query=query, 
-        saved_queries=saved_queries)
-
-@app.route('/delete_sql_query/<int:query_id>', methods=['DELETE'])
-def delete_sql_query(query_id):
-    db.sql_explorer.delete_saved_query(query_id)
-    saved_queries = db.sql_explorer.list_saved_queries()
-    return render_template('partials/sql_explorer/sql_query.html',
-        title="", 
-        query="", 
-        saved_queries=saved_queries)
-
-
-@ app.route("/sql_schema", methods=['GET'])
-def sql_schema():
-    schema_info = db.sql_explorer.get_schema_info()
-    mermaid_code = db.sql_explorer.generate_mermaid_er(schema_info)
-    create_sql = db.sql_explorer.generate_create_script(schema_info)
-    return render_template('partials/sql_explorer/schema.html', mermaid_code=mermaid_code, create_sql=create_sql)
-
-@app.route("/plot/<int:query_id>", methods=['GET'])
-def plot_query(query_id):
-    (title, query) = db.sql_explorer.get_saved_query(query_id)
-    #(results, columns, error) = db.sql_explorer.execute_sql(query)
-    results_df = db.read_sql_as_df(query)
-    plot_div = generate_plot(results_df, title)
-    return plot_div
-
-@app.route("/plot/show", methods=['POST'])
-def plot_unsaved_query(): # Rename?
-    query = request.form.get('query')
-    title = request.form.get('title')
-    results_df = db.read_sql_as_df(query)
-    plot_div = generate_plot(results_df, title)
-    return plot_div
-
 def get_routes():
     routes = []
     for rule in app.url_map.iter_rules():