fix(slack): harden hosted channel discovery

Author: Saga4

crates/locality-slack/fixtures/hosted-v1/provider-v1/discovery-malformed-updated-v1.json

@@ -0,0 +1,25 @@
+{
+  "ok": true,
+  "channels": [
+    {
+      "id": "C08ENGINEER1",
+      "context_team_id": "T08LOCALITY1",
+      "team_id": "T08LOCALITY1",
+      "name": "engineering",
+      "created": 1780000000,
+      "updated": "malformed-timestamp-secret",
+      "is_archived": false,
+      "is_private": true,
+      "is_shared": false,
+      "is_ext_shared": false,
+      "is_org_shared": false,
+      "is_member": true,
+      "shared_team_ids": [
+        "T08LOCALITY1"
+      ]
+    }
+  ],
+  "response_metadata": {
+    "next_cursor": ""
+  }
+}

crates/locality-slack/fixtures/hosted-v1/provider-v1/discovery-page-one-v1.json

@@ -0,0 +1,47 @@
+{
+  "ok": true,
+  "headers": {
+    "Authorization": "Bearer discovery-secret"
+  },
+  "cookies": "discovery-cookie",
+  "channels": [
+    {
+      "id": "C08ENGINEER1",
+      "context_team_id": "T08LOCALITY1",
+      "team_id": "T08LOCALITY1",
+      "name": "engineering",
+      "topic": {
+        "value": "Build safely",
+        "creator": "U08TOPIC001"
+      },
+      "purpose": {
+        "value": "Engineering"
+      },
+      "created": 1780000000,
+      "updated": 1780000010123,
+      "is_archived": false,
+      "is_private": true,
+      "is_shared": false,
+      "is_ext_shared": false,
+      "is_org_shared": false,
+      "is_member": true,
+      "shared_team_ids": [
+        "T08LOCALITY1"
+      ],
+      "latest": {
+        "text": "private-message-secret",
+        "files": [
+          {
+            "url_private": "https://provider.invalid/discovery-file-secret"
+          }
+        ]
+      },
+      "creator_profile": {
+        "email": "discovery-secret@example.invalid"
+      }
+    }
+  ],
+  "response_metadata": {
+    "next_cursor": "page-two"
+  }
+}

crates/locality-slack/fixtures/hosted-v1/provider-v1/discovery-page-two-v1.json

@@ -0,0 +1,28 @@
+{
+  "ok": true,
+  "channels": [
+    {
+      "id": "C08GENERAL01",
+      "context_team_id": "T08LOCALITY1",
+      "team_id": "T08LOCALITY1",
+      "name": "general",
+      "topic": {
+        "value": ""
+      },
+      "purpose": {
+        "value": ""
+      },
+      "created": 1780000020,
+      "is_archived": true,
+      "is_private": false,
+      "is_shared": false,
+      "is_ext_shared": false,
+      "is_org_shared": false,
+      "is_member": false,
+      "shared_team_ids": []
+    }
+  ],
+  "response_metadata": {
+    "next_cursor": ""
+  }
+}

crates/locality-slack/fixtures/hosted-v1/provider-v1/discovery-sanitized-channel-v1.json

@@ -0,0 +1,14 @@
+{
+  "channel": {
+    "team_id": "T08LOCALITY1",
+    "id": "C08ENGINEER1",
+    "name": "engineering",
+    "topic": "Build safely",
+    "purpose": "Engineering",
+    "created_ts": "1780000000.000000",
+    "updated_ts": "1780000010.123000",
+    "sharing": "private"
+  },
+  "is_member": true,
+  "is_archived": false
+}

crates/locality-slack/src/dto.rs

@@ -33,6 +33,7 @@ pub struct SlackConversation {
     pub is_member: Option<bool>,
     #[serde(default)]
     pub is_archived: bool,
+    /// Raw epoch-millisecond channel-settings timestamp from Slack.
     #[serde(default)]
     pub updated: Option<u64>,
     #[serde(default)]
@@ -189,7 +190,7 @@ mod tests {
               "is_mpim": false,
               "is_archived": false,
               "is_private": false,
-              "updated": 1780000000000000,
+              "updated": 1780000000123,
               "num_members": 12,
               "topic": { "value": "Company-wide updates" },
               "purpose": { "value": "Announcements" }
@@ -202,6 +203,7 @@ mod tests {
         assert!(page.ok);
         assert_eq!(page.channels[0].id, "C123");
         assert_eq!(page.channels[0].name.as_deref(), Some("general"));
+        assert_eq!(page.channels[0].updated, Some(1_780_000_000_123));
         assert_eq!(page.response_metadata.next_cursor.as_deref(), Some("abc"));
     }