feat(atlas): bootstrap example migration setup

Signed-off-by: Theo Bob Massard <tbobm@protonmail.com>

Author: tbobm

atlas.hcl

@@ -0,0 +1,8 @@
+env "local" {
+  url = "postgres://user:pass@db:5432/local_db?sslmode=disable"
+
+  migration {
+    dir = "file://migrations"
+    format = "golang-migrate"
+  }
+}

migrations/20250416_add_published_at_to_papers.sql

@@ -0,0 +1,3 @@
+-- modify: add 'published_at' to papers
+ALTER TABLE papers
+ADD COLUMN published_at TIMESTAMP;

schema/schema.hcl

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+schema "public" {
+  charset = "UTF8"
+  collate = "en_US.utf8"
+}
+
+table "papers" {
+  schema = schema.public
+  column "id" {
+    type = serial
+    primary_key = true
+  }
+  column "title" {
+    type = varchar(255)
+    null = false
+  }
+}
+
+table "mentions" {
+  schema = schema.public
+  column "id" {
+    type = serial
+    primary_key = true
+  }
+  column "paper_id" {
+    type = int
+    null = false
+  }
+  column "document" {
+    type = text
+    null = false
+  }
+
+  foreign_key "mentions_paper_fk" {
+    columns = [column.paper_id]
+    ref_table = table.papers
+    ref_columns = [column.id]
+    on_delete = "CASCADE"
+  }
+}
+