Improve performance oprimizing queries (#56)

* Extend test coverage

* Implement query optimization

* More aggressing code reuse

* Add more indexes and optimize usage

* Fix tests

* Further optimizations, improve counting to rely on backend DB

* chore: add Makefile for frontend asset minification

- Add comprehensive Makefile with targets for JS and CSS minification
- Implements instructions from ram/portal/static/js/src/README.md
- Provides targets: install, minify, minify-js, minify-css, clean, watch
- Fix main.min.js to only include theme_selector.js and tabs_selector.js
- Remove validators.js from minified output per README instructions

* Add a Makefile to compile JS and CSS

* docs: add blank line whitespace rule to AGENTS.md

Specify that blank lines must not contain any whitespace (spaces or tabs) to maintain code cleanliness and PEP 8 compliance

* Update for 0.20 release with optimizations

* Improve Makefile

ram/consist/models.py

@@ -8,6 +8,7 @@ from django.core.exceptions import ValidationError
 
 from ram.models import BaseModel
 from ram.utils import DeduplicatedStorage
+from ram.managers import ConsistManager
 from metadata.models import Company, Scale, Tag
 from roster.models import RollingStock
 
@@ -35,6 +36,8 @@ class Consist(BaseModel):
         blank=True,
     )
 
+    objects = ConsistManager()
+
     def __str__(self):
         return "{0} {1}".format(self.company, self.identifier)
 
@@ -45,6 +48,11 @@ class Consist(BaseModel):
     def length(self):
         return self.consist_item.filter(load=False).count()
 
+    @property
+    def loads_count(self):
+        """Count of loads in this consist using database aggregation."""
+        return self.consist_item.filter(load=True).count()
+
     def get_type_count(self):
         return self.consist_item.filter(load=False).annotate(
             type=models.F("rolling_stock__rolling_class__type__type")
@@ -71,6 +79,18 @@ class Consist(BaseModel):
 
     class Meta:
         ordering = ["company", "-creation_time"]
+        indexes = [
+            # Index for published filtering
+            models.Index(fields=["published"], name="consist_published_idx"),
+            # Index for scale filtering
+            models.Index(fields=["scale"], name="consist_scale_idx"),
+            # Index for company filtering
+            models.Index(fields=["company"], name="consist_company_idx"),
+            # Composite index for published+scale filtering
+            models.Index(
+                fields=["published", "scale"], name="consist_pub_scale_idx"
+            ),
+        ]
 
 
 class ConsistItem(models.Model):
@@ -86,9 +106,19 @@ class ConsistItem(models.Model):
         constraints = [
             models.UniqueConstraint(
                 fields=["consist", "rolling_stock"],
-                name="one_stock_per_consist"
+                name="one_stock_per_consist",
             )
         ]
+        indexes = [
+            # Index for filtering by load status
+            models.Index(fields=["load"], name="consist_item_load_idx"),
+            # Index for ordering
+            models.Index(fields=["order"], name="consist_item_order_idx"),
+            # Composite index for consist+load filtering
+            models.Index(
+                fields=["consist", "load"], name="consist_item_con_load_idx"
+            ),
+        ]
 
     def __str__(self):
         return "{0}".format(self.rolling_stock)