Make transcription confidence nullable

arkindex_worker/cache.py

@@ -172,7 +172,7 @@ class CachedTranscription(Model):
     id = UUIDField(primary_key=True)
     element = ForeignKeyField(CachedElement, backref="transcriptions")
     text = TextField()
-    confidence = FloatField()
+    confidence = FloatField(null=True)
     orientation = CharField(max_length=50)
     # Needed to filter transcriptions with cache
     worker_version_id = UUIDField(null=True)

tests/test_cache.py

@@ -63,7 +63,7 @@ CREATE TABLE "elements" ("id" TEXT NOT NULL PRIMARY KEY, "parent_id" TEXT, "type
 CREATE TABLE "entities" ("id" TEXT NOT NULL PRIMARY KEY, "type" VARCHAR(50) NOT NULL, "name" TEXT NOT NULL, "validated" INTEGER NOT NULL, "metas" text, "worker_run_id" TEXT)
 CREATE TABLE "images" ("id" TEXT NOT NULL PRIMARY KEY, "width" INTEGER NOT NULL, "height" INTEGER NOT NULL, "url" TEXT NOT NULL)
 CREATE TABLE "transcription_entities" ("transcription_id" TEXT NOT NULL, "entity_id" TEXT NOT NULL, "offset" INTEGER NOT NULL CHECK (offset >= 0), "length" INTEGER NOT NULL CHECK (length > 0), "worker_run_id" TEXT, "confidence" REAL, PRIMARY KEY ("transcription_id", "entity_id"), FOREIGN KEY ("transcription_id") REFERENCES "transcriptions" ("id"), FOREIGN KEY ("entity_id") REFERENCES "entities" ("id"))
-CREATE TABLE "transcriptions" ("id" TEXT NOT NULL PRIMARY KEY, "element_id" TEXT NOT NULL, "text" TEXT NOT NULL, "confidence" REAL NOT NULL, "orientation" VARCHAR(50) NOT NULL, "worker_version_id" TEXT, "worker_run_id" TEXT, FOREIGN KEY ("element_id") REFERENCES "elements" ("id"))"""
+CREATE TABLE "transcriptions" ("id" TEXT NOT NULL PRIMARY KEY, "element_id" TEXT NOT NULL, "text" TEXT NOT NULL, "confidence" REAL, "orientation" VARCHAR(50) NOT NULL, "worker_version_id" TEXT, "worker_run_id" TEXT, FOREIGN KEY ("element_id") REFERENCES "elements" ("id"))"""
 
     actual_schema = "\n".join(
         [