Generate highlights in the user timezone, now that we persist it

Also, remove the dates and duration from the highlights records. Those are not relevant, only the events-derived
key is. If two users with different timezones have different activities, they should see different summaries.

db/schema_cache.yml

@@ -496,7 +496,7 @@ columns:
     default_function:
     collation:
     comment:
-  - &37 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &36 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: title
     cast_type: *7
@@ -577,11 +577,11 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: all_access
-    cast_type: &33 !ruby/object:ActiveModel::Type::Boolean
+    cast_type: &32 !ruby/object:ActiveModel::Type::Boolean
       precision:
       scale:
       limit:
-    sql_type_metadata: &34 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
+    sql_type_metadata: &33 !ruby/object:ActiveRecord::ConnectionAdapters::SqlTypeMetadata
       sql_type: boolean
       type: :boolean
       limit:
@@ -875,7 +875,7 @@ columns:
     comment:
   filters_tags:
   - *20
-  - &36 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &35 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: tag_id
     cast_type: *3
@@ -942,7 +942,7 @@ columns:
     collation:
     comment:
   - *6
-  - &31 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: starts_at
     cast_type: *1
@@ -992,7 +992,7 @@ columns:
   - *9
   - *18
   period_highlights:
-  - &35 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &34 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: content
     cast_type: *15
@@ -1004,19 +1004,8 @@ columns:
     comment:
   - *30
   - *5
-  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
-    auto_increment:
-    name: duration
-    cast_type: *11
-    sql_type_metadata: *12
-    'null': false
-    default: 604800
-    default_function:
-    collation:
-    comment:
   - *6
   - *19
-  - *31
   - *9
   pins:
   - *23
@@ -1058,7 +1047,7 @@ columns:
     collation:
     comment:
   - *9
-  - &32 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+  - &31 !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: user_agent
     cast_type: *7
@@ -1204,21 +1193,21 @@ columns:
     collation:
     comment:
   - *9
-  - *32
+  - *31
   - *18
   steps:
   - *23
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: completed
-    cast_type: *33
-    sql_type_metadata: *34
+    cast_type: *32
+    sql_type_metadata: *33
     'null': false
     default: false
     default_function:
     collation:
     comment:
-  - *35
+  - *34
   - *5
   - *6
   - *9
@@ -1226,12 +1215,12 @@ columns:
   - *23
   - *5
   - *6
-  - *36
+  - *35
   - *9
   tags:
   - *5
   - *6
-  - *37
+  - *36
   - *9
   user_settings:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
@@ -1262,8 +1251,8 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: active
-    cast_type: *33
-    sql_type_metadata: *34
+    cast_type: *32
+    sql_type_metadata: *33
     'null': false
     default: true
     default_function:
@@ -1322,8 +1311,8 @@ columns:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
     name: watching
-    cast_type: *33
-    sql_type_metadata: *34
+    cast_type: *32
+    sql_type_metadata: *33
     'null': false
     default: true
     default_function:
@@ -2553,8 +2542,6 @@ indexes:
     unique: true
     columns:
     - key
-    - starts_at
-    - duration
     lengths: {}
     orders: {}
     opclasses: {}
@@ -3006,4 +2993,4 @@ indexes:
     comment:
     valid: true
   workflows: []
-version: 20250905093718
+version: 20250905101432