make model_weights descriptions optional

- these will be bad to have on low-value weights, eg. zero shot.
- want to capture this change now

_sql/migrations/2023-12-24-064234_alter_model_weights_nullable_description/down.sql

@@ -0,0 +1,9 @@
+-- noinspection SqlDialectInspectionForFile
+-- noinspection SqlNoDataSourceInspectionForFile
+-- noinspection SqlResolveForFile
+
+ALTER TABLE model_weights
+    CHANGE maybe_description_markdown description_markdown TEXT NOT NULL;
+
+ALTER TABLE model_weights
+    CHANGE maybe_description_rendered_html description_rendered_html TEXT NOT NULL;

_sql/migrations/2023-12-24-064234_alter_model_weights_nullable_description/up.sql

@@ -0,0 +1,9 @@
+-- noinspection SqlDialectInspectionForFile
+-- noinspection SqlNoDataSourceInspectionForFile
+-- noinspection SqlResolveForFile
+
+ALTER TABLE model_weights
+    CHANGE description_markdown maybe_description_markdown TEXT DEFAULT NULL;
+
+ALTER TABLE model_weights
+    CHANGE description_rendered_html maybe_description_rendered_html TEXT DEFAULT NULL;

_sql/migrations_squashed/model_weights/model_weights.sql

@@ -44,10 +44,14 @@ CREATE TABLE model_weights (
   maybe_cover_image_media_file_token VARCHAR(32) DEFAULT NULL,
 
   -- The description of the model in markdown.
-  description_markdown TEXT NOT NULL,
+  -- This is optional, since not all weights are of the same caliber (eg. zero shot models
+  -- don't deserve a description).
+  maybe_description_markdown TEXT DEFAULT NULL,
 
   -- Generated HTML (not user-editable).
-  description_rendered_html TEXT NOT NULL,
+  -- This is optional, since not all weights are of the same caliber (eg. zero shot
+  -- models don't deserve a description).
+  maybe_description_rendered_html TEXT DEFAULT NULL,
 
 
   -- ========== CREATOR DETAILS ==========