sse + ocr replanish

backend/internal/db/migrations/014_ocr_jobs.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS ocr_jobs;

backend/internal/db/migrations/014_ocr_jobs.up.sql

@@ -0,0 +1,12 @@
+CREATE TABLE ocr_jobs (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    resource_id UUID NOT NULL REFERENCES resources(id) ON DELETE CASCADE,
+    file_path TEXT NOT NULL DEFAULT '',
+    status TEXT NOT NULL DEFAULT 'pending' CHECK (status IN ('pending', 'processing', 'done', 'failed')),
+    error_message TEXT NOT NULL DEFAULT '',
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX idx_ocr_jobs_status ON ocr_jobs(status);
+CREATE INDEX idx_ocr_jobs_resource ON ocr_jobs(resource_id);