Add stock market calendar

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

backend/.sqlx/query-b3fbaff539723326ac5599b9ef25ded2148c9e46409975b7bf0b76f7ba0552e8.json

@@ -0,0 +1,32 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "DELETE FROM calendar RETURNING date, open, close",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "date",
+        "type_info": "Date"
+      },
+      {
+        "ordinal": 1,
+        "name": "open",
+        "type_info": "Time"
+      },
+      {
+        "ordinal": 2,
+        "name": "close",
+        "type_info": "Time"
+      }
+    ],
+    "parameters": {
+      "Left": []
+    },
+    "nullable": [
+      false,
+      false,
+      false
+    ]
+  },
+  "hash": "b3fbaff539723326ac5599b9ef25ded2148c9e46409975b7bf0b76f7ba0552e8"
+}