src/ai/apollo_client.rs

@@ -84,9 +84,7 @@ impl ApolloClient {
         match self.fetch_places_containing(base, lat, lon).await {
             Ok(places) => places,
             Err(err) => {
-                log::warn!(
-                    "apollo_client: places_containing({lat:.4}, {lon:.4}) failed: {err}"
-                );
+                log::warn!("apollo_client: places_containing({lat:.4}, {lon:.4}) failed: {err}");
                 Vec::new()
             }
         }

src/ai/insight_generator.rs

@@ -2120,7 +2120,10 @@ Return ONLY the summary, nothing else."#,
                 } else {
                     p.description.clone()
                 };
-                format!("- {}{}: {} (radius {} m)", p.name, category, desc, p.radius_m)
+                format!(
+                    "- {}{}: {} (radius {} m)",
+                    p.name, category, desc, p.radius_m
+                )
             })
             .collect::<Vec<_>>()
             .join("\n")
@@ -3367,7 +3370,8 @@ Return ONLY the summary, nothing else."#,
         // 10. Define tools. Hybrid mode omits `describe_photo` since the
         //     chat model receives the visual description inline.
         let offer_describe_tool = has_vision && !is_hybrid;
-        let tools = Self::build_tool_definitions(offer_describe_tool, self.apollo_client.is_enabled());
+        let tools =
+            Self::build_tool_definitions(offer_describe_tool, self.apollo_client.is_enabled());
 
         // 11. Build initial messages. In hybrid mode images are never
         //     attached to the wire message — the description is part of

src/exif.rs

@@ -160,6 +160,52 @@ pub fn extract_embedded_jpeg_preview(path: &Path) -> Option<Vec<u8>> {
         .max_by_key(|v| v.len())
 }
 
+/// Write GPS lat/lon into the file's EXIF in place via exiftool. Touches
+/// nothing else — camera, dates, MakerNote, etc. all stay as-is. Uses
+/// `-overwrite_original` so no `.orig` sidecar is left behind (the
+/// caller's responsibility to back up the file system if they want
+/// rollback). Returns Err if exiftool isn't on PATH, the file format
+/// doesn't support EXIF, lat/lon are out of range, or exiftool prints
+/// to stderr.
+///
+/// We pass lat/lon as positive decimal numbers and let the *Ref tags
+/// carry the sign (N/S, E/W). exiftool happily accepts signed decimals
+/// too, but the explicit ref form is unambiguous across exiftool
+/// versions and matches what cameras write.
+pub fn write_gps(path: &Path, lat: f64, lon: f64) -> Result<()> {
+    if !supports_exif(path) {
+        return Err(anyhow!(
+            "Format does not support EXIF GPS write: {}",
+            path.display()
+        ));
+    }
+    if !(-90.0..=90.0).contains(&lat) || !(-180.0..=180.0).contains(&lon) {
+        return Err(anyhow!("GPS coordinates out of range: {}, {}", lat, lon));
+    }
+    let lat_ref = if lat >= 0.0 { "N" } else { "S" };
+    let lon_ref = if lon >= 0.0 { "E" } else { "W" };
+    let lat_abs = lat.abs();
+    let lon_abs = lon.abs();
+    let output = Command::new("exiftool")
+        .arg("-overwrite_original")
+        .arg(format!("-GPSLatitude={}", lat_abs))
+        .arg(format!("-GPSLatitudeRef={}", lat_ref))
+        .arg(format!("-GPSLongitude={}", lon_abs))
+        .arg(format!("-GPSLongitudeRef={}", lon_ref))
+        .arg(path)
+        .output()
+        .map_err(|e| anyhow!("exiftool spawn failed (is it on PATH?): {}", e))?;
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        return Err(anyhow!(
+            "exiftool failed (exit {}): {}",
+            output.status.code().unwrap_or(-1),
+            stderr.trim()
+        ));
+    }
+    Ok(())
+}
+
 pub fn supports_exif(path: &Path) -> bool {
     if let Some(ext) = path.extension() {
         let ext_lower = ext.to_string_lossy().to_lowercase();

src/main.rs

@@ -394,6 +394,168 @@ async fn get_file_metadata(
     }
 }
 
+/// Body for `POST /image/exif/gps` — write GPS coordinates into a file's
+/// EXIF in place. Only `path` + `latitude` + `longitude` are required.
+/// `library` is optional (falls back to the primary library) and matches
+/// the convention of the other path-keyed routes.
+#[derive(serde::Deserialize)]
+struct SetGpsRequest {
+    path: String,
+    library: Option<String>,
+    latitude: f64,
+    longitude: f64,
+}
+
+#[post("/image/exif/gps")]
+async fn set_image_gps(
+    _: Claims,
+    request: HttpRequest,
+    body: web::Json<SetGpsRequest>,
+    app_state: Data<AppState>,
+    exif_dao: Data<Mutex<Box<dyn ExifDao>>>,
+) -> impl Responder {
+    let tracer = global_tracer();
+    let context = extract_context_from_request(&request);
+    let mut span = tracer.start_with_context("set_image_gps", &context);
+    let span_context =
+        opentelemetry::Context::new().with_remote_span_context(span.span_context().clone());
+
+    let library = libraries::resolve_library_param(&app_state, body.library.as_deref())
+        .ok()
+        .flatten()
+        .unwrap_or_else(|| app_state.primary_library());
+
+    // Same fallback as get_file_metadata: union-mode means a file may
+    // resolve under a sibling library.
+    let resolved = is_valid_full_path(&library.root_path, &body.path, false)
+        .filter(|p| p.exists())
+        .map(|p| (library, p))
+        .or_else(|| {
+            app_state.libraries.iter().find_map(|lib| {
+                if lib.id == library.id {
+                    return None;
+                }
+                is_valid_full_path(&lib.root_path, &body.path, false)
+                    .filter(|p| p.exists())
+                    .map(|p| (lib, p))
+            })
+        });
+
+    let (resolved_library, full_path) = match resolved {
+        Some(v) => v,
+        None => {
+            span.set_status(Status::error("file not found"));
+            return HttpResponse::NotFound().body("File not found");
+        }
+    };
+
+    if !exif::supports_exif(&full_path) {
+        return HttpResponse::BadRequest().body("File format does not support EXIF GPS write");
+    }
+
+    if let Err(e) = exif::write_gps(&full_path, body.latitude, body.longitude) {
+        let msg = format!("exiftool write failed: {}", e);
+        error!("{}", msg);
+        span.set_status(Status::error(msg.clone()));
+        return HttpResponse::InternalServerError().body(msg);
+    }
+
+    // Re-read EXIF from disk (the write path doesn't tell us the rest of
+    // the parsed fields back, and we want the DB row to match what
+    // extract_exif_from_path would now produce). Update the existing row
+    // rather than insert — this endpoint is invoked on already-indexed
+    // files only.
+    let extracted = match exif::extract_exif_from_path(&full_path) {
+        Ok(d) => d,
+        Err(e) => {
+            // GPS was written successfully but re-extraction failed; surface
+            // a 500 because the DB will now disagree with disk until the
+            // next file scan rewrites it.
+            let msg = format!("EXIF re-read failed after write: {}", e);
+            error!("{}", msg);
+            return HttpResponse::InternalServerError().body(msg);
+        }
+    };
+    let now = Utc::now().timestamp();
+    let normalized_path = body.path.replace('\\', "/");
+    let insert_exif = InsertImageExif {
+        library_id: resolved_library.id,
+        file_path: normalized_path.clone(),
+        camera_make: extracted.camera_make,
+        camera_model: extracted.camera_model,
+        lens_model: extracted.lens_model,
+        width: extracted.width,
+        height: extracted.height,
+        orientation: extracted.orientation,
+        gps_latitude: extracted.gps_latitude.map(|v| v as f32),
+        gps_longitude: extracted.gps_longitude.map(|v| v as f32),
+        gps_altitude: extracted.gps_altitude.map(|v| v as f32),
+        focal_length: extracted.focal_length.map(|v| v as f32),
+        aperture: extracted.aperture.map(|v| v as f32),
+        shutter_speed: extracted.shutter_speed,
+        iso: extracted.iso,
+        date_taken: extracted.date_taken,
+        // Created_time is preserved by update_exif (it doesn't touch the
+        // column); pass any int — it's ignored in the UPDATE statement.
+        created_time: now,
+        last_modified: now,
+        // Hash + size aren't touched in update_exif either, but the file
+        // bytes did change — best-effort recompute so the new hash lands
+        // on the next call to get_exif. Failure here just leaves the old
+        // values in place.
+        content_hash: content_hash::compute(&full_path)
+            .ok()
+            .map(|c| c.content_hash),
+        size_bytes: content_hash::compute(&full_path).ok().map(|c| c.size_bytes),
+    };
+
+    let updated = {
+        let mut dao = exif_dao.lock().expect("Unable to lock ExifDao");
+        // If the row doesn't exist yet (file isn't indexed for some reason),
+        // insert instead so the GPS write is at least visible the moment
+        // the watcher catches up.
+        match dao.get_exif(&span_context, &normalized_path) {
+            Ok(Some(_)) => dao.update_exif(&span_context, insert_exif),
+            Ok(None) => dao.store_exif(&span_context, insert_exif),
+            Err(_) => dao.update_exif(&span_context, insert_exif),
+        }
+    };
+
+    match updated {
+        Ok(row) => {
+            // Mirror the file metadata so the client gets the new size /
+            // mtime in the same response and can refresh its cached
+            // metadata block in one round-trip.
+            let fs_meta = std::fs::metadata(&full_path).ok();
+            let mut response: MetadataResponse = match fs_meta {
+                Some(m) => m.into(),
+                None => MetadataResponse {
+                    created: None,
+                    modified: None,
+                    size: 0,
+                    exif: None,
+                    filename_date: None,
+                    library_id: None,
+                    library_name: None,
+                },
+            };
+            response.exif = Some(row.into());
+            response.library_id = Some(resolved_library.id);
+            response.library_name = Some(resolved_library.name.clone());
+            response.filename_date =
+                memories::extract_date_from_filename(&body.path).map(|dt| dt.timestamp());
+            span.set_status(Status::Ok);
+            HttpResponse::Ok().json(response)
+        }
+        Err(e) => {
+            let msg = format!("EXIF DB update failed: {:?}", e);
+            error!("{}", msg);
+            span.set_status(Status::error(msg.clone()));
+            HttpResponse::InternalServerError().body(msg)
+        }
+    }
+}
+
 #[derive(serde::Deserialize)]
 struct UploadQuery {
     library: Option<String>,
@@ -1415,6 +1577,7 @@ fn main() -> std::io::Result<()> {
                 .service(put_add_favorite)
                 .service(delete_favorite)
                 .service(get_file_metadata)
+                .service(set_image_gps)
                 .service(memories::list_memories)
                 .service(ai::generate_insight_handler)
                 .service(ai::generate_agentic_insight_handler)

src/state.rs

@@ -1,6 +1,6 @@
+use crate::ai::apollo_client::ApolloClient;
 use crate::ai::insight_chat::{ChatLockMap, InsightChatService};
 use crate::ai::openrouter::OpenRouterClient;
-use crate::ai::apollo_client::ApolloClient;
 use crate::ai::{InsightGenerator, OllamaClient, SmsApiClient};
 use crate::database::{
     CalendarEventDao, DailySummaryDao, ExifDao, InsightDao, KnowledgeDao, LocationHistoryDao,