diff --git a/.env.example b/.env.example
index a51ddf59..6faeac56 100644
--- a/.env.example
+++ b/.env.example
@@ -36,3 +36,14 @@ FLUENT_AI_KEY=fai_dev_admin
 # (e.g. POST /tools/greek-room/repeated-words), so leave this empty. If/when
 # fluent-ai adopts versioned routing, set this to /api/v1 — no code change needed.
 FLUENT_AI_API_PREFIX=
+
+# Cloudflare R2 — audio recording storage
+# Account ID found in Cloudflare dashboard → R2 → Overview
+R2_ACCOUNT_ID=your-cloudflare-account-id
+# S3-compatible Access Key ID generated in R2 → Manage R2 API Tokens
+R2_ACCESS_KEY_ID=your-r2-access-key-id
+# Corresponding secret access key
+R2_SECRET_ACCESS_KEY=your-r2-secret-access-key
+# Name of the R2 bucket to store audio recordings
+R2_BUCKET_NAME=your-bucket-name
+
diff --git a/.env.test b/.env.test
index a5c6c0a9..6f08ac46 100644
--- a/.env.test
+++ b/.env.test
@@ -13,3 +13,9 @@ EMAIL_SERVICE_SENDER=no-reply@test.example.com
 FRONTEND_URL=http://localhost:5173
 FLUENT_AI_URL=http://localhost:8200
 FLUENT_AI_KEY=test-only-dummy-fluent-ai-key
+
+# R2 credentials for testing
+R2_ACCOUNT_ID=test-r2-account-id
+R2_ACCESS_KEY_ID=test-r2-access-key-id
+R2_SECRET_ACCESS_KEY=test-r2-secret-access-key
+R2_BUCKET_NAME=test-r2-bucket-name
diff --git a/src/app.ts b/src/app.ts
index c88eff93..8466bd42 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -21,6 +21,7 @@ import '@/domains/projects/users/project-users.route';
 import '@/domains/users/projects/user-projects.route';
 import '@/domains/chapter-assignments/presence/chapter-assignments-presence.route';
 import '@/domains/ai-tools/ai-tools.route';
+import '@/domains/recordings/recordings.route';
 configureOpenAPI(server);
 
 export default server;
diff --git a/src/db/migrations/0012_add_recordings.sql b/src/db/migrations/0012_add_recordings.sql
new file mode 100644
index 00000000..4d1e207c
--- /dev/null
+++ b/src/db/migrations/0012_add_recordings.sql
@@ -0,0 +1,16 @@
+CREATE TABLE "recordings" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"project_unit_id" integer NOT NULL,
+	"bible_text_id" integer NOT NULL,
+	"relative_path" varchar NOT NULL,
+	"recorded_by_user_id" integer NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	CONSTRAINT "recordings_relative_path_unique" UNIQUE("relative_path")
+);
+--> statement-breakpoint
+ALTER TABLE "recordings" ADD CONSTRAINT "recordings_project_unit_id_project_units_id_fk" FOREIGN KEY ("project_unit_id") REFERENCES "public"."project_units"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "recordings" ADD CONSTRAINT "recordings_bible_text_id_bible_texts_id_fk" FOREIGN KEY ("bible_text_id") REFERENCES "public"."bible_texts"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "recordings" ADD CONSTRAINT "recordings_recorded_by_user_id_users_id_fk" FOREIGN KEY ("recorded_by_user_id") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "idx_recordings_project_unit" ON "recordings" USING btree ("project_unit_id");--> statement-breakpoint
+CREATE INDEX "idx_recordings_bible_text" ON "recordings" USING btree ("bible_text_id");--> statement-breakpoint
+CREATE INDEX "idx_recordings_user" ON "recordings" USING btree ("recorded_by_user_id");
\ No newline at end of file
diff --git a/src/db/migrations/0013_add_metadata_to_recordings.sql b/src/db/migrations/0013_add_metadata_to_recordings.sql
new file mode 100644
index 00000000..b20c05eb
--- /dev/null
+++ b/src/db/migrations/0013_add_metadata_to_recordings.sql
@@ -0,0 +1 @@
+ALTER TABLE "recordings" ADD COLUMN "metadata" jsonb;
\ No newline at end of file
diff --git a/src/db/migrations/meta/0012_snapshot.json b/src/db/migrations/meta/0012_snapshot.json
new file mode 100644
index 00000000..e5100e4e
--- /dev/null
+++ b/src/db/migrations/meta/0012_snapshot.json
@@ -0,0 +1,2419 @@
+{
+  "id": "097dc57b-deea-4274-bafe-4b854a0ad1ff",
+  "prevId": "f6a47766-9387-4565-93c4-9237d431a0e4",
+  "version": "7",
+  "dialect": "postgresql",
+  "tables": {
+    "public.active_chapter_editors": {
+      "name": "active_chapter_editors",
+      "schema": "",
+      "columns": {
+        "chapter_assignment_id": {
+          "name": "chapter_assignment_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "started_at": {
+          "name": "started_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "last_heartbeat": {
+          "name": "last_heartbeat",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "idx_active_editors_chapter": {
+          "name": "idx_active_editors_chapter",
+          "columns": [
+            {
+              "expression": "chapter_assignment_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "active_chapter_editors_chapter_assignment_id_chapter_assignments_id_fk": {
+          "name": "active_chapter_editors_chapter_assignment_id_chapter_assignments_id_fk",
+          "tableFrom": "active_chapter_editors",
+          "tableTo": "chapter_assignments",
+          "columnsFrom": ["chapter_assignment_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "active_chapter_editors_user_id_users_id_fk": {
+          "name": "active_chapter_editors_user_id_users_id_fk",
+          "tableFrom": "active_chapter_editors",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {
+        "active_chapter_editors_chapter_assignment_id_user_id_pk": {
+          "name": "active_chapter_editors_chapter_assignment_id_user_id_pk",
+          "columns": ["chapter_assignment_id", "user_id"]
+        }
+      },
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_account": {
+      "name": "auth_account",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "account_id": {
+          "name": "account_id",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "provider_id": {
+          "name": "provider_id",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "access_token": {
+          "name": "access_token",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "refresh_token": {
+          "name": "refresh_token",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "id_token": {
+          "name": "id_token",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "access_token_expires_at": {
+          "name": "access_token_expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "refresh_token_expires_at": {
+          "name": "refresh_token_expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "scope": {
+          "name": "scope",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "password": {
+          "name": "password",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "auth_account_user_id_auth_user_id_fk": {
+          "name": "auth_account_user_id_auth_user_id_fk",
+          "tableFrom": "auth_account",
+          "tableTo": "auth_user",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_audit_log": {
+      "name": "auth_audit_log",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "event": {
+          "name": "event",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "ip_address": {
+          "name": "ip_address",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_agent": {
+          "name": "user_agent",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "metadata": {
+          "name": "metadata",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'{}'::jsonb"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "idx_audit_log_user": {
+          "name": "idx_audit_log_user",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_audit_log_event": {
+          "name": "idx_audit_log_event",
+          "columns": [
+            {
+              "expression": "event",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_audit_log_created": {
+          "name": "idx_audit_log_created",
+          "columns": [
+            {
+              "expression": "created_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "auth_audit_log_user_id_auth_user_id_fk": {
+          "name": "auth_audit_log_user_id_auth_user_id_fk",
+          "tableFrom": "auth_audit_log",
+          "tableTo": "auth_user",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_session": {
+      "name": "auth_session",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "token": {
+          "name": "token",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "ip_address": {
+          "name": "ip_address",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_agent": {
+          "name": "user_agent",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "is_mobile": {
+          "name": "is_mobile",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "auth_session_user_id_auth_user_id_fk": {
+          "name": "auth_session_user_id_auth_user_id_fk",
+          "tableFrom": "auth_session",
+          "tableTo": "auth_user",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "auth_session_token_unique": {
+          "name": "auth_session_token_unique",
+          "nullsNotDistinct": false,
+          "columns": ["token"]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_user": {
+      "name": "auth_user",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "email": {
+          "name": "email",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "email_verified": {
+          "name": "email_verified",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        },
+        "image": {
+          "name": "image",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "two_factor_enabled": {
+          "name": "two_factor_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "auth_user_email_unique": {
+          "name": "auth_user_email_unique",
+          "nullsNotDistinct": false,
+          "columns": ["email"]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_verification": {
+      "name": "auth_verification",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "identifier": {
+          "name": "identifier",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "value": {
+          "name": "value",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.bible_books": {
+      "name": "bible_books",
+      "schema": "",
+      "columns": {
+        "bible_id": {
+          "name": "bible_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "book_id": {
+          "name": "book_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "bible_books_bible_id_bibles_id_fk": {
+          "name": "bible_books_bible_id_bibles_id_fk",
+          "tableFrom": "bible_books",
+          "tableTo": "bibles",
+          "columnsFrom": ["bible_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "bible_books_book_id_books_id_fk": {
+          "name": "bible_books_book_id_books_id_fk",
+          "tableFrom": "bible_books",
+          "tableTo": "books",
+          "columnsFrom": ["book_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.bible_texts": {
+      "name": "bible_texts",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "bible_id": {
+          "name": "bible_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "book_id": {
+          "name": "book_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "chapter_number": {
+          "name": "chapter_number",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "verse_number": {
+          "name": "verse_number",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "text": {
+          "name": "text",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "idx_bible_texts_bible_book_chapter": {
+          "name": "idx_bible_texts_bible_book_chapter",
+          "columns": [
+            {
+              "expression": "bible_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "book_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "chapter_number",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_bible_texts_bible_book_chapter_verse": {
+          "name": "idx_bible_texts_bible_book_chapter_verse",
+          "columns": [
+            {
+              "expression": "bible_id",
+              "isExpression": false,
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+    },
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+          "onUpdate": "no action"
+        },
+        "user_chapter_assignment_editor_state_chapter_assignment_id_chapter_assignments_id_fk": {
+          "name": "user_chapter_assignment_editor_state_chapter_assignment_id_chapter_assignments_id_fk",
+          "tableFrom": "user_chapter_assignment_editor_state",
+          "tableTo": "chapter_assignments",
+          "columnsFrom": ["chapter_assignment_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.users": {
+      "name": "users",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "auth_user_id": {
+          "name": "auth_user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "username": {
+          "name": "username",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "email": {
+          "name": "email",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "first_name": {
+          "name": "first_name",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "last_name": {
+          "name": "last_name",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "role": {
+          "name": "role",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "organization": {
+          "name": "organization",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "status": {
+          "name": "status",
+          "type": "user_status",
+          "typeSchema": "public",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'invited'"
+        },
+        "created_by": {
+          "name": "created_by",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "users_auth_user_id_auth_user_id_fk": {
+          "name": "users_auth_user_id_auth_user_id_fk",
+          "tableFrom": "users",
+          "tableTo": "auth_user",
+          "columnsFrom": ["auth_user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        },
+        "users_role_roles_id_fk": {
+          "name": "users_role_roles_id_fk",
+          "tableFrom": "users",
+          "tableTo": "roles",
+          "columnsFrom": ["role"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "users_organization_organizations_id_fk": {
+          "name": "users_organization_organizations_id_fk",
+          "tableFrom": "users",
+          "tableTo": "organizations",
+          "columnsFrom": ["organization"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "users_created_by_users_id_fk": {
+          "name": "users_created_by_users_id_fk",
+          "tableFrom": "users",
+          "tableTo": "users",
+          "columnsFrom": ["created_by"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "users_username_unique": {
+          "name": "users_username_unique",
+          "nullsNotDistinct": false,
+          "columns": ["username"]
+        },
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "nullsNotDistinct": false,
+          "columns": ["email"]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    }
+  },
+  "enums": {
+    "public.assignment_role": {
+      "name": "assignment_role",
+      "schema": "public",
+      "values": ["drafter", "peer_checker"]
+    },
+    "public.chapter_status": {
+      "name": "chapter_status",
+      "schema": "public",
+      "values": [
+        "not_started",
+        "draft",
+        "peer_check",
+        "community_review",
+        "linguist_check",
+        "theological_check",
+        "consultant_check",
+        "complete"
+      ]
+    },
+    "public.project_assignment_status": {
+      "name": "project_assignment_status",
+      "schema": "public",
+      "values": ["active", "not_assigned"]
+    },
+    "public.project_status": {
+      "name": "project_status",
+      "schema": "public",
+      "values": ["not_started", "in_progress", "completed"]
+    },
+    "public.script_direction": {
+      "name": "script_direction",
+      "schema": "public",
+      "values": ["ltr", "rtl"]
+    },
+    "public.user_status": {
+      "name": "user_status",
+      "schema": "public",
+      "values": ["invited", "verified", "inactive"]
+    }
+  },
+  "schemas": {},
+  "sequences": {},
+  "roles": {},
+  "policies": {},
+  "views": {},
+  "_meta": {
+    "columns": {},
+    "schemas": {},
+    "tables": {}
+  }
+}
diff --git a/src/db/migrations/meta/0013_snapshot.json b/src/db/migrations/meta/0013_snapshot.json
new file mode 100644
index 00000000..a60b29bc
--- /dev/null
+++ b/src/db/migrations/meta/0013_snapshot.json
@@ -0,0 +1,2425 @@
+{
+  "id": "32c46bec-1f67-49cb-86e7-a95f202ff5b4",
+  "prevId": "097dc57b-deea-4274-bafe-4b854a0ad1ff",
+  "version": "7",
+  "dialect": "postgresql",
+  "tables": {
+    "public.active_chapter_editors": {
+      "name": "active_chapter_editors",
+      "schema": "",
+      "columns": {
+        "chapter_assignment_id": {
+          "name": "chapter_assignment_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "started_at": {
+          "name": "started_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "last_heartbeat": {
+          "name": "last_heartbeat",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "idx_active_editors_chapter": {
+          "name": "idx_active_editors_chapter",
+          "columns": [
+            {
+              "expression": "chapter_assignment_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "active_chapter_editors_chapter_assignment_id_chapter_assignments_id_fk": {
+          "name": "active_chapter_editors_chapter_assignment_id_chapter_assignments_id_fk",
+          "tableFrom": "active_chapter_editors",
+          "tableTo": "chapter_assignments",
+          "columnsFrom": ["chapter_assignment_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "active_chapter_editors_user_id_users_id_fk": {
+          "name": "active_chapter_editors_user_id_users_id_fk",
+          "tableFrom": "active_chapter_editors",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {
+        "active_chapter_editors_chapter_assignment_id_user_id_pk": {
+          "name": "active_chapter_editors_chapter_assignment_id_user_id_pk",
+          "columns": ["chapter_assignment_id", "user_id"]
+        }
+      },
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_account": {
+      "name": "auth_account",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "account_id": {
+          "name": "account_id",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "provider_id": {
+          "name": "provider_id",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "access_token": {
+          "name": "access_token",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "refresh_token": {
+          "name": "refresh_token",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "id_token": {
+          "name": "id_token",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "access_token_expires_at": {
+          "name": "access_token_expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "refresh_token_expires_at": {
+          "name": "refresh_token_expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "scope": {
+          "name": "scope",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "password": {
+          "name": "password",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "auth_account_user_id_auth_user_id_fk": {
+          "name": "auth_account_user_id_auth_user_id_fk",
+          "tableFrom": "auth_account",
+          "tableTo": "auth_user",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_audit_log": {
+      "name": "auth_audit_log",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "event": {
+          "name": "event",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "ip_address": {
+          "name": "ip_address",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_agent": {
+          "name": "user_agent",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "metadata": {
+          "name": "metadata",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "'{}'::jsonb"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "idx_audit_log_user": {
+          "name": "idx_audit_log_user",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_audit_log_event": {
+          "name": "idx_audit_log_event",
+          "columns": [
+            {
+              "expression": "event",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        },
+        "idx_audit_log_created": {
+          "name": "idx_audit_log_created",
+          "columns": [
+            {
+              "expression": "created_at",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": false,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "auth_audit_log_user_id_auth_user_id_fk": {
+          "name": "auth_audit_log_user_id_auth_user_id_fk",
+          "tableFrom": "auth_audit_log",
+          "tableTo": "auth_user",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_session": {
+      "name": "auth_session",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "token": {
+          "name": "token",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "ip_address": {
+          "name": "ip_address",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_agent": {
+          "name": "user_agent",
+          "type": "varchar",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "user_id": {
+          "name": "user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "is_mobile": {
+          "name": "is_mobile",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "auth_session_user_id_auth_user_id_fk": {
+          "name": "auth_session_user_id_auth_user_id_fk",
+          "tableFrom": "auth_session",
+          "tableTo": "auth_user",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "auth_session_token_unique": {
+          "name": "auth_session_token_unique",
+          "nullsNotDistinct": false,
+          "columns": ["token"]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_user": {
+      "name": "auth_user",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "email": {
+          "name": "email",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "email_verified": {
+          "name": "email_verified",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": true,
+          "default": false
+        },
+        "image": {
+          "name": "image",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "two_factor_enabled": {
+          "name": "two_factor_enabled",
+          "type": "boolean",
+          "primaryKey": false,
+          "notNull": false,
+          "default": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "auth_user_email_unique": {
+          "name": "auth_user_email_unique",
+          "nullsNotDistinct": false,
+          "columns": ["email"]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.auth_verification": {
+      "name": "auth_verification",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(36)",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "identifier": {
+          "name": "identifier",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "value": {
+          "name": "value",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "expires_at": {
+          "name": "expires_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {},
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.bible_books": {
+      "name": "bible_books",
+      "schema": "",
+      "columns": {
+        "bible_id": {
+          "name": "bible_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "book_id": {
+          "name": "book_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "bible_books_bible_id_bibles_id_fk": {
+          "name": "bible_books_bible_id_bibles_id_fk",
+          "tableFrom": "bible_books",
+          "tableTo": "bibles",
+          "columnsFrom": ["bible_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "bible_books_book_id_books_id_fk": {
+          "name": "bible_books_book_id_books_id_fk",
+          "tableFrom": "bible_books",
+          "tableTo": "books",
+          "columnsFrom": ["book_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.bible_texts": {
+      "name": "bible_texts",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
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+          "default": "now()"
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+          "name": "id",
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+          "default": "now()"
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+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
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+          "type": "serial",
+          "primaryKey": true,
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+          "notNull": true
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+          "default": "now()"
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+          "concurrently": false,
+          "method": "btree",
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+        },
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+      "checkConstraints": {},
+      "isRLSEnabled": false
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+          "default": "now()"
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+      "checkConstraints": {},
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+          "default": "now()"
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+          "default": "now()"
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+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.translated_verses": {
+      "name": "translated_verses",
+      "schema": "",
+      "columns": {
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+          "name": "id",
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+          "name": "content",
+          "type": "varchar",
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+          "notNull": true
+        },
+        "bible_text_id": {
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+          "notNull": true
+        },
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+          "notNull": true,
+          "default": "now()"
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+          "notNull": true,
+          "default": "now()"
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+          "onDelete": "cascade",
+          "onUpdate": "cascade"
+        },
+        "translated_verses_bible_text_id_bible_texts_id_fk": {
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+          "tableFrom": "translated_verses",
+          "tableTo": "bible_texts",
+          "columnsFrom": ["bible_text_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
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+          "tableFrom": "translated_verses",
+          "tableTo": "users",
+          "columnsFrom": ["assigned_user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
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+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.user_chapter_assignment_editor_state": {
+      "name": "user_chapter_assignment_editor_state",
+      "schema": "",
+      "columns": {
+        "user_id": {
+          "name": "user_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "chapter_assignment_id": {
+          "name": "chapter_assignment_id",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "resources": {
+          "name": "resources",
+          "type": "jsonb",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {
+        "uq_user_chapter_assignment_editor_state": {
+          "name": "uq_user_chapter_assignment_editor_state",
+          "columns": [
+            {
+              "expression": "user_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            },
+            {
+              "expression": "chapter_assignment_id",
+              "isExpression": false,
+              "asc": true,
+              "nulls": "last"
+            }
+          ],
+          "isUnique": true,
+          "concurrently": false,
+          "method": "btree",
+          "with": {}
+        }
+      },
+      "foreignKeys": {
+        "user_chapter_assignment_editor_state_user_id_users_id_fk": {
+          "name": "user_chapter_assignment_editor_state_user_id_users_id_fk",
+          "tableFrom": "user_chapter_assignment_editor_state",
+          "tableTo": "users",
+          "columnsFrom": ["user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        },
+        "user_chapter_assignment_editor_state_chapter_assignment_id_chapter_assignments_id_fk": {
+          "name": "user_chapter_assignment_editor_state_chapter_assignment_id_chapter_assignments_id_fk",
+          "tableFrom": "user_chapter_assignment_editor_state",
+          "tableTo": "chapter_assignments",
+          "columnsFrom": ["chapter_assignment_id"],
+          "columnsTo": ["id"],
+          "onDelete": "cascade",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {},
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    },
+    "public.users": {
+      "name": "users",
+      "schema": "",
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "serial",
+          "primaryKey": true,
+          "notNull": true
+        },
+        "auth_user_id": {
+          "name": "auth_user_id",
+          "type": "varchar(36)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "username": {
+          "name": "username",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "email": {
+          "name": "email",
+          "type": "varchar(255)",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "first_name": {
+          "name": "first_name",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "last_name": {
+          "name": "last_name",
+          "type": "varchar(100)",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "role": {
+          "name": "role",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "organization": {
+          "name": "organization",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": true
+        },
+        "status": {
+          "name": "status",
+          "type": "user_status",
+          "typeSchema": "public",
+          "primaryKey": false,
+          "notNull": true,
+          "default": "'invited'"
+        },
+        "created_by": {
+          "name": "created_by",
+          "type": "integer",
+          "primaryKey": false,
+          "notNull": false
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        },
+        "updated_at": {
+          "name": "updated_at",
+          "type": "timestamp",
+          "primaryKey": false,
+          "notNull": false,
+          "default": "now()"
+        }
+      },
+      "indexes": {},
+      "foreignKeys": {
+        "users_auth_user_id_auth_user_id_fk": {
+          "name": "users_auth_user_id_auth_user_id_fk",
+          "tableFrom": "users",
+          "tableTo": "auth_user",
+          "columnsFrom": ["auth_user_id"],
+          "columnsTo": ["id"],
+          "onDelete": "set null",
+          "onUpdate": "no action"
+        },
+        "users_role_roles_id_fk": {
+          "name": "users_role_roles_id_fk",
+          "tableFrom": "users",
+          "tableTo": "roles",
+          "columnsFrom": ["role"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "users_organization_organizations_id_fk": {
+          "name": "users_organization_organizations_id_fk",
+          "tableFrom": "users",
+          "tableTo": "organizations",
+          "columnsFrom": ["organization"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        },
+        "users_created_by_users_id_fk": {
+          "name": "users_created_by_users_id_fk",
+          "tableFrom": "users",
+          "tableTo": "users",
+          "columnsFrom": ["created_by"],
+          "columnsTo": ["id"],
+          "onDelete": "no action",
+          "onUpdate": "no action"
+        }
+      },
+      "compositePrimaryKeys": {},
+      "uniqueConstraints": {
+        "users_username_unique": {
+          "name": "users_username_unique",
+          "nullsNotDistinct": false,
+          "columns": ["username"]
+        },
+        "users_email_unique": {
+          "name": "users_email_unique",
+          "nullsNotDistinct": false,
+          "columns": ["email"]
+        }
+      },
+      "policies": {},
+      "checkConstraints": {},
+      "isRLSEnabled": false
+    }
+  },
+  "enums": {
+    "public.assignment_role": {
+      "name": "assignment_role",
+      "schema": "public",
+      "values": ["drafter", "peer_checker"]
+    },
+    "public.chapter_status": {
+      "name": "chapter_status",
+      "schema": "public",
+      "values": [
+        "not_started",
+        "draft",
+        "peer_check",
+        "community_review",
+        "linguist_check",
+        "theological_check",
+        "consultant_check",
+        "complete"
+      ]
+    },
+    "public.project_assignment_status": {
+      "name": "project_assignment_status",
+      "schema": "public",
+      "values": ["active", "not_assigned"]
+    },
+    "public.project_status": {
+      "name": "project_status",
+      "schema": "public",
+      "values": ["not_started", "in_progress", "completed"]
+    },
+    "public.script_direction": {
+      "name": "script_direction",
+      "schema": "public",
+      "values": ["ltr", "rtl"]
+    },
+    "public.user_status": {
+      "name": "user_status",
+      "schema": "public",
+      "values": ["invited", "verified", "inactive"]
+    }
+  },
+  "schemas": {},
+  "sequences": {},
+  "roles": {},
+  "policies": {},
+  "views": {},
+  "_meta": {
+    "columns": {},
+    "schemas": {},
+    "tables": {}
+  }
+}
diff --git a/src/db/migrations/meta/_journal.json b/src/db/migrations/meta/_journal.json
index 0eb2cd70..8f6c248e 100644
--- a/src/db/migrations/meta/_journal.json
+++ b/src/db/migrations/meta/_journal.json
@@ -85,6 +85,20 @@
       "when": 1779441453059,
       "tag": "0011_add_is_mobile_to_auth_session",
       "breakpoints": true
+    },
+    {
+      "idx": 12,
+      "version": "7",
+      "when": 1781609375158,
+      "tag": "0012_add_recordings",
+      "breakpoints": true
+    },
+    {
+      "idx": 13,
+      "version": "7",
+      "when": 1781682962147,
+      "tag": "0013_add_metadata_to_recordings",
+      "breakpoints": true
     }
   ]
 }
diff --git a/src/db/schema.ts b/src/db/schema.ts
index a0799fcb..74df1cd3 100644
--- a/src/db/schema.ts
+++ b/src/db/schema.ts
@@ -496,6 +496,35 @@ export const active_chapter_editors = pgTable(
   ]
 );
 
+// ─── Recordings ───────────────────────────────────────────────────────────────
+// Each row represents one audio recording uploaded from the mobile app.
+// `relative_path` is unique and serves as the Cloudflare R2 object key.
+
+export const recordings = pgTable(
+  'recordings',
+  {
+    id: serial('id').primaryKey(),
+    projectUnitId: integer('project_unit_id')
+      .notNull()
+      .references(() => project_units.id, { onDelete: 'cascade' }),
+    bibleTextId: integer('bible_text_id')
+      .notNull()
+      .references(() => bible_texts.id),
+    // R2 object key — e.g. "4-Hindi_NT_2024/audio/MAT/1/3.m4a"
+    relativePath: varchar('relative_path').notNull().unique(),
+    recordedByUserId: integer('recorded_by_user_id')
+      .notNull()
+      .references(() => users.id),
+    metadata: jsonb('metadata').$type<{ size: number | null; recorded_at: string }>(),
+    createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+  },
+  (table) => [
+    index('idx_recordings_project_unit').on(table.projectUnitId),
+    index('idx_recordings_bible_text').on(table.bibleTextId),
+    index('idx_recordings_user').on(table.recordedByUserId),
+  ]
+);
+
 const { createInsertSchema, createSelectSchema } = createSchemaFactory({
   zodInstance: z,
 });
@@ -529,6 +558,25 @@ export const selectProjectUsersSchema = createSelectSchema(project_users);
 export const selectPermissionsSchema = createSelectSchema(permissions);
 export const selectRolePermissionsSchema = createSelectSchema(role_permissions);
 export const selectActiveChapterEditorsSchema = createSelectSchema(active_chapter_editors);
+export const selectRecordingsSchema = createSelectSchema(recordings);
+
+export const insertRecordingsSchema = createInsertSchema(recordings, {
+  projectUnitId: (schema) => schema.int().positive(),
+  bibleTextId: (schema) => schema.int().positive(),
+  relativePath: (schema) => schema.min(1),
+  recordedByUserId: (schema) => schema.int().positive(),
+  metadata: () =>
+    z
+      .object({
+        size: z.number().nullable(),
+        recorded_at: z.string(),
+      })
+      .nullable()
+      .optional(),
+}).omit({
+  id: true,
+  createdAt: true,
+});
 
 export const insertUsersSchema = createInsertSchema(users, {
   username: (schema) => schema.min(1).max(100),
diff --git a/src/domains/recordings/recordings.repository.ts b/src/domains/recordings/recordings.repository.ts
new file mode 100644
index 00000000..2e3ce800
--- /dev/null
+++ b/src/domains/recordings/recordings.repository.ts
@@ -0,0 +1,69 @@
+import { sql } from 'drizzle-orm';
+
+import { db } from '@/db';
+import * as schema from '@/db/schema';
+import { logger } from '@/lib/logger';
+
+import type { UpsertRecordingData } from './recordings.types';
+
+// ─── Queries ──────────────────────────────────────────────────────────────────
+
+export async function upsertRecording(
+  data: UpsertRecordingData
+): Promise<{ relativePath: string }> {
+  const { projectUnitId, bibleTextId, relativePath, recordedByUserId, metadata } = data;
+
+  await db
+    .insert(schema.recordings)
+    .values({
+      projectUnitId,
+      bibleTextId,
+      relativePath,
+      recordedByUserId,
+      metadata: metadata ?? null,
+    })
+    .onConflictDoUpdate({
+      target: schema.recordings.relativePath,
+      set: {
+        metadata: sql`excluded.metadata`,
+        recordedByUserId: sql`excluded.recorded_by_user_id`,
+      },
+    });
+
+  logger.info('Recording upserted in DB', { relativePath, projectUnitId, bibleTextId });
+
+  return { relativePath };
+}
+
+// ─── COMMENTED OUT — assignment validation (pending model clarification) ───────
+//
+// Validates that the calling user is the assigned translator for the chapter
+// that contains the given bible_text_id + project_unit_id pair.
+//
+// export async function validateAssignment(
+//   projectUnitId: number,
+//   bibleTextId: number,
+//   userId: number,
+// ): Promise<boolean> {
+//   const rows = await db
+//     .select({ id: schema.chapter_assignments.id })
+//     .from(schema.chapter_assignments)
+//     .innerJoin(
+//       schema.bible_texts,
+//       and(
+//         eq(schema.bible_texts.bibleId,       schema.chapter_assignments.bibleId),
+//         eq(schema.bible_texts.bookId,         schema.chapter_assignments.bookId),
+//         eq(schema.bible_texts.chapterNumber,  schema.chapter_assignments.chapterNumber),
+//       ),
+//     )
+//     .where(
+//       and(
+//         eq(schema.chapter_assignments.projectUnitId,    projectUnitId),
+//         eq(schema.bible_texts.id,                       bibleTextId),
+//         eq(schema.chapter_assignments.assignedUserId,   userId),
+//       ),
+//     )
+//     .limit(1);
+//
+//   return rows.length > 0;
+// }
diff --git a/src/domains/recordings/recordings.route.ts b/src/domains/recordings/recordings.route.ts
new file mode 100644
index 00000000..b986f3b9
--- /dev/null
+++ b/src/domains/recordings/recordings.route.ts
@@ -0,0 +1,151 @@
+import { createRoute } from '@hono/zod-openapi';
+import * as HttpStatusCodes from 'stoker/http-status-codes';
+import * as HttpStatusPhrases from 'stoker/http-status-phrases';
+import { jsonContent } from 'stoker/openapi/helpers';
+import { createMessageObjectSchema } from 'stoker/openapi/schemas';
+
+import { logger } from '@/lib/logger';
+import { authenticateUser } from '@/middlewares/role-auth';
+import { server } from '@/server/server';
+
+import * as service from './recordings.service';
+import { syncSuccessSchema } from './recordings.types';
+
+// ─── Route definition ─────────────────────────────────────────────────────────
+
+const syncRecordingRoute = createRoute({
+  tags: ['Recordings'],
+  method: 'post',
+  path: '/recordings/sync',
+  middleware: [authenticateUser] as const,
+  responses: {
+    [HttpStatusCodes.OK]: jsonContent(
+      syncSuccessSchema,
+      'Recording uploaded to Cloudflare R2 and registered in the database.'
+    ),
+    [HttpStatusCodes.BAD_REQUEST]: jsonContent(
+      createMessageObjectSchema('Bad Request'),
+      'Missing or invalid form fields.'
+    ),
+    [HttpStatusCodes.UNAUTHORIZED]: jsonContent(
+      createMessageObjectSchema('Unauthorized'),
+      'Missing or invalid Bearer token.'
+    ),
+    [HttpStatusCodes.FORBIDDEN]: jsonContent(
+      createMessageObjectSchema('Forbidden'),
+      'User account is inactive.'
+    ),
+    [HttpStatusCodes.NOT_FOUND]: jsonContent(
+      createMessageObjectSchema('Not Found'),
+      'Project unit not found.'
+    ),
+    [HttpStatusCodes.INTERNAL_SERVER_ERROR]: jsonContent(
+      createMessageObjectSchema(HttpStatusPhrases.INTERNAL_SERVER_ERROR),
+      'R2 upload or database error.'
+    ),
+  },
+  summary: 'Sync a mobile audio recording to cloud storage',
+  description:
+    'Accepts multipart/form-data with fields: `project_unit_id` (text), ' +
+    '`bible_text_id` (text), `relative_path` (text), `file` (binary .m4a), ' +
+    '`file_size` (text, optional), `recorded_at` (ISO 8601 text, optional). ' +
+    "The caller's identity is resolved entirely from the Authorization Bearer token — " +
+    'no user_id field is accepted in the request body.',
+});
+
+// ─── Handler ──────────────────────────────────────────────────────────────────
+
+server.openapi(syncRecordingRoute, async (c) => {
+  const user = c.get('user')!;
+
+  // ── 1. Parse multipart body ────────────────────────────────────────────────
+  let body: Record<string, string | File | Blob>;
+  try {
+    body = await c.req.parseBody();
+  } catch {
+    logger.warn('Failed to parse multipart body', { userId: user.id });
+    return c.json({ message: 'Invalid multipart request body.' }, HttpStatusCodes.BAD_REQUEST);
+  }
+
+  const projectUnitIdRaw = (body as any).project_unit_id;
+  const bibleTextIdRaw = (body as any).bible_text_id;
+  const relativePath = (body as any).relative_path;
+  const file = (body as any).file;
+  const fileSizeRaw = (body as any).file_size;
+  const recordedAtRaw = (body as any).recorded_at;
+
+  // ── 2. Validate required fields ────────────────────────────────────────────
+  if (
+    typeof projectUnitIdRaw !== 'string' ||
+    typeof bibleTextIdRaw !== 'string' ||
+    typeof relativePath !== 'string' ||
+    !(file instanceof Blob)
+  ) {
+    return c.json(
+      { message: 'Missing required fields: project_unit_id, bible_text_id, relative_path, file.' },
+      HttpStatusCodes.BAD_REQUEST
+    );
+  }
+
+  const projectUnitId = Number(projectUnitIdRaw);
+  const bibleTextId = Number(bibleTextIdRaw);
+
+  if (!Number.isInteger(projectUnitId) || projectUnitId <= 0) {
+    return c.json(
+      { message: 'project_unit_id must be a positive integer.' },
+      HttpStatusCodes.BAD_REQUEST
+    );
+  }
+
+  if (!Number.isInteger(bibleTextId) || bibleTextId <= 0) {
+    return c.json(
+      { message: 'bible_text_id must be a positive integer.' },
+      HttpStatusCodes.BAD_REQUEST
+    );
+  }
+
+  if (!relativePath.trim()) {
+    return c.json({ message: 'relative_path must not be empty.' }, HttpStatusCodes.BAD_REQUEST);
+  }
+
+  // ── 3. Delegate to service ─────────────────────────────────────────────────
+  try {
+    await service.syncRecording({
+      projectUnitId,
+      bibleTextId,
+      relativePath,
+      file,
+      fileSizeRaw,
+      recordedAtRaw,
+      userId: user.id,
+    });
+
+    return c.json(
+      {
+        success: true as const,
+        message: 'Audio recording synchronized and saved cleanly.',
+        data: { relative_path: relativePath },
+      },
+      HttpStatusCodes.OK
+    );
+  } catch (error: any) {
+    if (error?.code === 'NOT_FOUND') {
+      return c.json({ message: error.message }, HttpStatusCodes.NOT_FOUND);
+    }
+    if (error?.code === 'INVALID_PATH') {
+      return c.json({ message: error.message }, HttpStatusCodes.BAD_REQUEST);
+    }
+    if (error?.code === 'FORBIDDEN') {
+      return c.json({ message: error.message }, HttpStatusCodes.FORBIDDEN);
+    }
+    logger.error('Recording sync failed', {
+      userId: user.id,
+      projectUnitId,
+      error: error instanceof Error ? error.message : String(error),
+    });
+    return c.json(
+      { message: 'An unexpected error occurred.' },
+      HttpStatusCodes.INTERNAL_SERVER_ERROR
+    );
+  }
+});
diff --git a/src/domains/recordings/recordings.service.ts b/src/domains/recordings/recordings.service.ts
new file mode 100644
index 00000000..5e008e23
--- /dev/null
+++ b/src/domains/recordings/recordings.service.ts
@@ -0,0 +1,166 @@
+import { eq } from 'drizzle-orm';
+import { Buffer } from 'node:buffer';
+
+import { db } from '@/db';
+import * as schema from '@/db/schema';
+import { logger } from '@/lib/logger';
+import { uploadToR2 } from '@/lib/r2-upload';
+
+import type { RecordingMetadata, UpsertRecordingData } from './recordings.types';
+
+import * as repo from './recordings.repository';
+
+// ─── Types ────────────────────────────────────────────────────────────────────
+
+export interface SyncRecordingInput {
+  projectUnitId: number;
+  bibleTextId: number;
+  relativePath: string;
+  file: Blob;
+  fileSizeRaw: unknown;
+  recordedAtRaw: unknown;
+  userId: number;
+}
+
+export interface SyncRecordingResult {
+  transformedRelativePath: string;
+}
+
+// ─── Helpers ──────────────────────────────────────────────────────────────────
+
+/**
+ * Transforms the client-supplied relative path into a server-side R2 key:
+ *   "<projectName>/<rest>"  →  "<projectUnitId>-<projectName>/<rest>"
+ */
+export function buildR2Key(relativePath: string, projectUnitId: number): string | null {
+  const cleanPath = relativePath.replace(/^\/+/, '');
+  const firstSlashIdx = cleanPath.indexOf('/');
+  if (firstSlashIdx === -1) return null;
+
+  const projectName = cleanPath.substring(0, firstSlashIdx);
+  const rest = cleanPath.substring(firstSlashIdx + 1);
+  if (!rest.trim()) return null;
+  return `${projectUnitId}-${projectName}/${rest}`;
+}
+
+/**
+ * Builds the optional device metadata object from raw form-field values.
+ */
+export function buildMetadata(fileSizeRaw: unknown, recordedAtRaw: unknown): RecordingMetadata {
+  const fileSize = fileSizeRaw != null ? Number(fileSizeRaw) : null;
+  const recordedAt =
+    typeof recordedAtRaw === 'string' && recordedAtRaw.trim()
+      ? recordedAtRaw.trim()
+      : new Date().toISOString();
+
+  return { size: Number.isFinite(fileSize) ? fileSize : null, recorded_at: recordedAt };
+}
+
+// ─── Service functions ────────────────────────────────────────────────────────
+
+/**
+ * Verifies that the given projectUnitId exists in the database.
+ * Returns true if found, false otherwise.
+ *
+ * TODO: The userId parameter is currently unused in the lookup, but will be
+ * utilized once assignment validation checks are uncommented and enforced.
+ */
+export async function verifyProjectUnitExists(
+  projectUnitId: number,
+  userId: number
+): Promise<boolean> {
+  try {
+    const result = await db
+      .select({ id: schema.project_units.id })
+      .from(schema.project_units)
+      .where(eq(schema.project_units.id, projectUnitId))
+      .limit(1);
+
+    return result.length > 0;
+  } catch (error) {
+    logger.error('Failed to query project unit', { error, projectUnitId, userId });
+    throw error;
+  }
+}
+
+/**
+ * Orchestrates the full audio sync workflow:
+ *   1. Validates the project unit exists.
+ *   2. Builds the R2 key from the relative path.
+ *   3. Uploads the audio buffer to Cloudflare R2.
+ *   4. Upserts the recording record in PostgreSQL.
+ *
+ * Returns the transformed R2 key on success.
+ * Throws on any unrecoverable error so the route can map it to an HTTP response.
+ */
+export async function syncRecording(input: SyncRecordingInput): Promise<SyncRecordingResult> {
+  const { projectUnitId, bibleTextId, relativePath, file, fileSizeRaw, recordedAtRaw, userId } =
+    input;
+
+  // 1. Verify project unit
+  const exists = await verifyProjectUnitExists(projectUnitId, userId);
+  if (!exists) {
+    throw Object.assign(new Error('Project unit not found.'), { code: 'NOT_FOUND' });
+  }
+
+  // 2. Build R2 key
+  const transformedRelativePath = buildR2Key(relativePath, projectUnitId);
+  if (!transformedRelativePath) {
+    throw Object.assign(new Error('Invalid relative_path format.'), { code: 'INVALID_PATH' });
+  }
+
+  // ── COMMENTED OUT — Assignment validation (pending model clarification) ─────
+  //
+  // Confirms the Bearer-token user is the assigned translator for this chapter.
+  // Uncomment once the assignment model is finalised.
+  //
+  // const isAssigned = await repo.validateAssignment(projectUnitId, bibleTextId, userId);
+  // if (!isAssigned) {
+  //   logger.warn('Unauthorized upload attempt: user not assigned to chapter', {
+  //     userId, projectUnitId, bibleTextId,
+  //   });
+  //   throw Object.assign(
+  //     new Error('You are not assigned to this translation task.'),
+  //     { code: 'FORBIDDEN' },
+  //   );
+  // }
+
+  // 3. Upload to Cloudflare R2
+  const audioBuffer = Buffer.from(await file.arrayBuffer());
+  const contentType = file.type || 'audio/mp4';
+  await uploadToR2(audioBuffer, transformedRelativePath, contentType);
+
+  // 4. Upsert in PostgreSQL
+  const metadata = buildMetadata(fileSizeRaw, recordedAtRaw);
+
+  const upsertData: UpsertRecordingData = {
+    projectUnitId,
+    bibleTextId,
+    relativePath: transformedRelativePath,
+    recordedByUserId: userId,
+    metadata,
+  };
+
+  try {
+    await repo.upsertRecording(upsertData);
+  } catch (error) {
+    logger.error('DB upsert failed after successful R2 upload', {
+      transformedRelativePath,
+      userId,
+      error: error instanceof Error ? error.message : String(error),
+    });
+    throw Object.assign(new Error('Recording uploaded but failed to register in database.'), {
+      code: 'DB_ERROR',
+    });
+  }
+
+  logger.info('Recording synced successfully', {
+    transformedRelativePath,
+    userId,
+    projectUnitId,
+    bibleTextId,
+    sizeBytes: audioBuffer.length,
+  });
+
+  return { transformedRelativePath };
+}
diff --git a/src/domains/recordings/recordings.types.ts b/src/domains/recordings/recordings.types.ts
new file mode 100644
index 00000000..c581c04e
--- /dev/null
+++ b/src/domains/recordings/recordings.types.ts
@@ -0,0 +1,30 @@
+import { z } from '@hono/zod-openapi';
+
+// ─── Request / Domain types ───────────────────────────────────────────────────
+
+export interface RecordingMetadata {
+  size: number | null;
+  recorded_at: string;
+}
+
+export interface UpsertRecordingData {
+  projectUnitId: number;
+  bibleTextId: number;
+  relativePath: string;
+  recordedByUserId: number;
+  metadata?: RecordingMetadata;
+}
+
+// ─── Response schemas ─────────────────────────────────────────────────────────
+
+export const syncSuccessSchema = z.object({
+  success: z.literal(true),
+  message: z.string(),
+  data: z.object({
+    relative_path: z.string(),
+  }),
+});
+
+// ─── Inferred types ───────────────────────────────────────────────────────────
+
+export type SyncSuccessResponse = z.infer<typeof syncSuccessSchema>;
diff --git a/src/env.ts b/src/env.ts
index ca05521c..eebdfd98 100644
--- a/src/env.ts
+++ b/src/env.ts
@@ -41,6 +41,12 @@ const EnvSchema = z.object({
   // '/api/v1' via env with no code change. Leading slash optional; trailing
   // slashes are trimmed when the request URL is assembled.
   FLUENT_AI_API_PREFIX: z.string().default(''),
+
+  // ── Cloudflare R2 audio storage ───────────────────────────────────────────
+  R2_ACCOUNT_ID: z.string().min(1),
+  R2_ACCESS_KEY_ID: z.string().min(1),
+  R2_SECRET_ACCESS_KEY: z.string().min(1),
+  R2_BUCKET_NAME: z.string().min(1),
 });
 
 export type env = z.infer<typeof EnvSchema>;
diff --git a/src/lib/r2-upload.ts b/src/lib/r2-upload.ts
new file mode 100644
index 00000000..d3ac3163
--- /dev/null
+++ b/src/lib/r2-upload.ts
@@ -0,0 +1,206 @@
+/**
+ * r2-upload.ts
+ *
+ * Server-side Cloudflare R2 upload using AWS Signature V4.
+ * Uses Node's native `node:crypto` — no external packages or hand-rolled crypto.
+ *
+ * Credentials are read from the validated env schema (never hardcoded).
+ */
+
+import { Buffer } from 'node:buffer';
+import { createHash, createHmac } from 'node:crypto';
+
+import env from '@/env';
+import { logger } from '@/lib/logger';
+
+// ─── Crypto helpers ───────────────────────────────────────────────────────────
+
+function sha256Hex(data: string | Buffer): string {
+  return createHash('sha256').update(data).digest('hex');
+}
+
+function hmacSha256(key: Buffer | string, data: string): Buffer {
+  const keyBuf = typeof key === 'string' ? Buffer.from(key, 'utf8') : key;
+  return createHmac('sha256', keyBuf).update(data, 'utf8').digest();
+}
+
+function toHex(buf: Buffer): string {
+  return buf.toString('hex');
+}
+
+// ─── Date helpers ─────────────────────────────────────────────────────────────
+
+function pad2(n: number): string {
+  return String(n).padStart(2, '0');
+}
+
+function getAmzTimestamps(now: Date): { dateStamp: string; amzDate: string } {
+  const dateStamp =
+    `${now.getUTCFullYear()}` + `${pad2(now.getUTCMonth() + 1)}` + `${pad2(now.getUTCDate())}`;
+
+  const amzDate =
+    `${dateStamp}T` +
+    `${pad2(now.getUTCHours())}` +
+    `${pad2(now.getUTCMinutes())}` +
+    `${pad2(now.getUTCSeconds())}Z`;
+
+  return { dateStamp, amzDate };
+}
+
+// ─── SigV4 builder ────────────────────────────────────────────────────────────
+
+function buildAuthorizationHeader(params: {
+  method: string;
+  host: string;
+  urlPath: string;
+  contentType: string;
+  payloadHash: string;
+  amzDate: string;
+  dateStamp: string;
+  accessKeyId: string;
+  secretAccessKey: string;
+}): string {
+  const {
+    method,
+    host,
+    urlPath,
+    contentType,
+    payloadHash,
+    amzDate,
+    dateStamp,
+    accessKeyId,
+    secretAccessKey,
+  } = params;
+
+  const region = 'auto';
+  const service = 's3';
+  const signedHeaders = 'content-type;host;x-amz-content-sha256;x-amz-date';
+
+  // Canonical headers must be sorted alphabetically by header name
+  const canonicalHeaders =
+    `content-type:${contentType}\n` +
+    `host:${host}\n` +
+    `x-amz-content-sha256:${payloadHash}\n` +
+    `x-amz-date:${amzDate}\n`;
+
+  const canonicalRequest = [
+    method,
+    urlPath,
+    '', // query string (empty for direct PUT)
+    canonicalHeaders,
+    signedHeaders,
+    payloadHash,
+  ].join('\n');
+
+  const credentialScope = `${dateStamp}/${region}/${service}/aws4_request`;
+
+  const stringToSign = [
+    'AWS4-HMAC-SHA256',
+    amzDate,
+    credentialScope,
+    sha256Hex(canonicalRequest),
+  ].join('\n');
+
+  // Derive signing key
+  const kDate = hmacSha256(`AWS4${secretAccessKey}`, dateStamp);
+  const kRegion = hmacSha256(kDate, region);
+  const kService = hmacSha256(kRegion, service);
+  const kSigning = hmacSha256(kService, 'aws4_request');
+  const signature = toHex(hmacSha256(kSigning, stringToSign));
+
+  return (
+    `AWS4-HMAC-SHA256 Credential=${accessKeyId}/${credentialScope}, ` +
+    `SignedHeaders=${signedHeaders}, Signature=${signature}`
+  );
+}
+
+// ─── Public API ───────────────────────────────────────────────────────────────
+
+/**
+ * Uploads a binary buffer to Cloudflare R2 using AWS Signature V4.
+ *
+ * @param buffer      The raw audio file content.
+ * @param r2Key       Object key in the bucket (used verbatim — must be the
+ *                    `relative_path` sent by the mobile client).
+ * @param contentType MIME type, e.g. 'audio/mp4'. Defaults to 'audio/mp4'.
+ *
+ * @throws Error with the R2 error body if the upload is rejected.
+ */
+export async function uploadToR2(
+  buffer: Buffer,
+  r2Key: string,
+  contentType: string = 'audio/mp4'
+): Promise<void> {
+  const accountId = env.R2_ACCOUNT_ID;
+  const accessKeyId = env.R2_ACCESS_KEY_ID;
+  const secretAccessKey = env.R2_SECRET_ACCESS_KEY;
+  const bucket = env.R2_BUCKET_NAME;
+
+  const host = `${accountId}.r2.cloudflarestorage.com`;
+
+  // Encode each path segment individually to preserve slashes as separators
+  const encodedKey = r2Key.split('/').map(encodeURIComponent).join('/');
+
+  const urlPath = `/${bucket}/${encodedKey}`;
+  const url = `https://${host}${urlPath}`;
+
+  const { dateStamp, amzDate } = getAmzTimestamps(new Date());
+  const payloadHash = sha256Hex(buffer);
+
+  const authorization = buildAuthorizationHeader({
+    method: 'PUT',
+    host,
+    urlPath,
+    contentType,
+    payloadHash,
+    amzDate,
+    dateStamp,
+    accessKeyId,
+    secretAccessKey,
+  });
+
+  logger.info('Uploading to R2', {
+    r2Key,
+    contentType,
+    sizeBytes: buffer.length,
+    bucket,
+  });
+
+  const controller = new AbortController();
+  const timeoutId = setTimeout(() => controller.abort(), 15000);
+
+  let response: Response;
+  try {
+    response = await fetch(url, {
+      method: 'PUT',
+      headers: {
+        'Content-Type': contentType,
+        'x-amz-date': amzDate,
+        'x-amz-content-sha256': payloadHash,
+        Authorization: authorization,
+      },
+      body: buffer,
+      signal: controller.signal,
+    });
+  } catch (networkError) {
+    logger.error('R2 network request failed', { r2Key, error: networkError });
+    throw new Error(
+      `R2 network error: ${networkError instanceof Error ? networkError.message : String(networkError)}`
+    );
+  } finally {
+    clearTimeout(timeoutId);
+  }
+
+  if (!response.ok) {
+    const errorBody = await response.text().catch(() => '(could not read response body)');
+    logger.error('R2 rejected upload', {
+      r2Key,
+      status: response.status,
+      statusText: response.statusText,
+      errorBody,
+    });
+    throw new Error(`R2 upload failed [HTTP ${response.status}]: ${errorBody}`);
+  }
+
+  logger.info('R2 upload successful', { r2Key, sizeBytes: buffer.length });
+}