Add stock market calendar

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

backend/.sqlx/query-8d268f6532ab7fbad0b31286d3c2e0981687c4e0ff48ccc538cf06b3bd616c60.json

@@ -0,0 +1,36 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "INSERT INTO calendar (date, open, close)\n        SELECT * FROM UNNEST($1::date[], $2::time[], $3::time[])\n        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": [
+        "DateArray",
+        "TimeArray",
+        "TimeArray"
+      ]
+    },
+    "nullable": [
+      false,
+      false,
+      false
+    ]
+  },
+  "hash": "8d268f6532ab7fbad0b31286d3c2e0981687c4e0ff48ccc538cf06b3bd616c60"
+}