diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 64b3c9e..aef798f 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -4,16 +4,16 @@
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     "children": [
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+        "id": "d16dcbc379f22118",
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+            "id": "7212df225ebf759a",
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               "type": "markdown",
               "state": {
-                "file": "content/tils/asdf_direnv.md",
+                "file": "content/tils/always_generated_ecto_boolean.md",
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               }
@@ -85,7 +85,7 @@
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               "type": "backlink",
               "state": {
-                "file": "content/tils/asdf_direnv.md",
+                "file": "content/tils/always_generated_ecto_boolean.md",
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                 "sortOrder": "alphabetical",
@@ -112,7 +112,7 @@
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               "type": "file-properties",
               "state": {
-                "file": "content/tils/asdf_direnv.md"
+                "file": "content/tils/always_generated_ecto_boolean.md"
               }
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           }
@@ -132,10 +132,12 @@
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     }
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-  "active": "7f987208866df706",
+  "active": "7212df225ebf759a",
   "lastOpenFiles": [
     "content/tils/struct_pattern_matching.md",
+    "content/tils/pdf_obsidian_at_page.md",
     "content/tils/asdf_direnv.md",
+    "content/tils/always_generated_ecto_boolean.md",
     "_site/tils/asdf_direnv/index.html",
     "_site/tils/asdf_direnv",
     "_site/tils/Untitled/index.html",
@@ -168,7 +170,6 @@
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     "node_modules/liquidjs/node_modules/commander/Readme.md",
     "node_modules/minipass/node_modules/yallist/README.md",
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     "_site/images/ultimate-dungeon-terrain-3.jpg",
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     "_site/images/ultimate-dungeon-terrain-1.jpg",
diff --git a/content/tils/always_generated_ecto_boolean.md b/content/tils/always_generated_ecto_boolean.md
new file mode 100644
index 0000000..dd684c9
--- /dev/null
+++ b/content/tils/always_generated_ecto_boolean.md
@@ -0,0 +1,45 @@
+---
+title: Always Generated Boolean tied to a date, smart deleted states in sql
+date: 2023-09-25
+---
+It's a common scenario to not only know that something happened, but also _when_ it happened. Such is the common case with something like the following example of marking a user as `deleted?: true`. But, rather than relying on keeping two attributes up to date (`deleted` and `deleted_at`) we can rely on the database to have an automatically generated boolean to handle that for us.
+
+The following example implements a reversable database migration, field, and function used to mark a user as deleted (at the current timestamp) and undeleted (or reactivated). With all three implemented we'll be able to tell if a user is deleted `user.deleted? == true` and toggle a user's deletion `delete_user(current_user)` and `undelete_user(deleted_user)`.
+
+```elixir
+# mix ecto.gen.migration add_deleted_to_user
+defmodule App.Repo.Migrations.AddDeletedToUser do
+  use Ecto.Migration
+
+  def change do
+    alter table(:users) do
+      add(:deleted_at, :naive_datetime)
+    end
+
+    execute(
+      "alter table users add column deleted boolean generated always as (deleted_at is null) stored",
+      "alter table users drop column deleted"
+    )
+  end
+end
+```
+
+```elixir
+# App.Accounts.User
+field(:deleted?, :boolean, read_after_writes: true, source: :deleted)
+field(:deleted_at, :naive_datetime)
+```
+
+```elixir
+  def delete_user(%User{} = user),
+    do:
+      user
+      |> User.changeset(%{deleted_at: NaiveDateTime.utc_now()})
+      |> Repo.update()
+  
+  def undelete_user(%User{} = user),
+    do:
+      user
+      |> User.changeset(%{deleted_at: nil})
+      |> Repo.update()
+```
\ No newline at end of file