diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index f261b96b2e3..8e9af47bba9 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -4,4 +4,5 @@ LICENSE.txt @hashintel/legal
 LICENSE.md @hashintel/legal
 
 # Database migrations
-/apps/hash-graph/libs/graph/postgres_migrations/ @hashintel/db-admins
+/libs/@local/graph/postgres-store/postgres_migrations/ @hashintel/db-admins
+/libs/@local/graph/migrations/graph-migrations/ @hashintel/db-admins
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 3bde95faa90..93e7c11c8d5 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -204,7 +204,8 @@ jobs:
     name: Global
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Warm up repository
         uses: ./.github/actions/warm-up-repo
@@ -343,6 +344,29 @@ jobs:
             exit 1
           fi
 
+      - name: Install Python
+        uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
+        with:
+          python-version: 3.12
+
+      - name: Install SQLFluff
+        run: pip install sqlfluff
+
+      - name: SQLFluff
+        run: sqlfluff lint --warn-unused-ignores
+
+      - name: Crate SQLFluff annotationss
+        if: failure() && github.event.pull_request.head.repo.full_name == github.repository
+        run: sqlfluff lint --warn-unused-ignores --format github-annotation --write-output annotations.json --annotation-level failure --nofail
+
+      - name: Annotate
+        uses: yuzutech/annotations-action@0e061a6e3ac848299310b6429b60d67cafd4e7f8 # v0.5.0
+        if: failure() && github.event.pull_request.head.repo.full_name == github.repository
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          title: "SQLFluff Lint"
+          input: "annotations.json"
+
   passed:
     name: Linting passed
     needs: [setup, package, global]
diff --git a/.sqlfluff b/.sqlfluff
new file mode 100644
index 00000000000..7661d4689b3
--- /dev/null
+++ b/.sqlfluff
@@ -0,0 +1,48 @@
+[sqlfluff]
+dialect = postgres
+encoding = utf-8
+
+max_line_length = 100
+large_file_skip_byte_limit = 100000
+
+
+[sqlfluff:indentation]
+indented_ctes = True
+indented_on_contents = False
+allow_implicit_indents = True
+
+[sqlfluff:rules]
+single_table_references = qualified
+
+[sqlfluff:rules:capitalisation.keywords]
+capitalisation_policy = upper
+
+[sqlfluff:rules:capitalisation.identifiers]
+extended_capitalisation_policy = lower
+
+[sqlfluff:rules:capitalisation.functions]
+extended_capitalisation_policy = lower
+
+[sqlfluff:rules:capitalisation.literals]
+capitalisation_policy = upper
+
+[sqlfluff:rules:capitalisation.types]
+extended_capitalisation_policy = upper
+
+
+[sqlfluff:rules:convention.count_rows]
+prefer_count_1 = True
+
+[sqlfluff:rules:ambiguous.column_references]
+# GROUP BY/ORDER BY column references
+group_by_and_order_by_style = explicit
+
+
+[sqlfluff:rules:convention.not_equal]
+# Consistent usage of preferred "not equal to" comparison
+preferred_not_equal_style = c_style
+
+
+[sqlfluff:rules:convention.casting_style]
+# SQL type casting
+preferred_type_casting_style = shorthand
diff --git a/infra/docker/citus/prod/initdb/0000_init.sql b/infra/docker/citus/prod/initdb/0000_init.sql
index 3064ba29f50..8746012d46c 100644
--- a/infra/docker/citus/prod/initdb/0000_init.sql
+++ b/infra/docker/citus/prod/initdb/0000_init.sql
@@ -1,2 +1,2 @@
 CREATE EXTENSION
-  citus;
+citus;
diff --git a/libs/@local/graph/migrations/graph-migrations/v006__data_types/up.sql b/libs/@local/graph/migrations/graph-migrations/v006__data_types/up.sql
index ae4034cb035..5132ca6be99 100644
--- a/libs/@local/graph/migrations/graph-migrations/v006__data_types/up.sql
+++ b/libs/@local/graph/migrations/graph-migrations/v006__data_types/up.sql
@@ -36,9 +36,9 @@ CREATE TABLE data_type_conversions (
 
 CREATE VIEW data_type_conversion_aggregation AS
 SELECT
-    source_data_type_ontology_id,
-    array_agg(target_data_type_base_url) AS target_data_type_base_urls,
-    array_agg("into") AS intos,
-    array_agg("from") AS froms
+    data_type_conversions.source_data_type_ontology_id,
+    array_agg(data_type_conversions.target_data_type_base_url) AS target_data_type_base_urls,
+    array_agg(data_type_conversions."into") AS intos,
+    array_agg(data_type_conversions."from") AS froms
 FROM data_type_conversions
-GROUP BY source_data_type_ontology_id;
+GROUP BY data_type_conversions.source_data_type_ontology_id;
diff --git a/libs/@local/graph/migrations/graph-migrations/v009__entities/up.sql b/libs/@local/graph/migrations/graph-migrations/v009__entities/up.sql
index 00a24e2632e..e67948da184 100644
--- a/libs/@local/graph/migrations/graph-migrations/v009__entities/up.sql
+++ b/libs/@local/graph/migrations/graph-migrations/v009__entities/up.sql
@@ -77,7 +77,7 @@ CREATE TABLE entity_has_left_entity (
     FOREIGN KEY (left_web_id, left_entity_uuid) REFERENCES entity_ids
 );
 CREATE INDEX entity_has_left_entity_source_idx
-    ON entity_has_left_entity(web_id, entity_uuid);
+ON entity_has_left_entity (web_id, entity_uuid);
 
 CREATE TABLE entity_has_right_entity (
     web_id UUID NOT NULL,
@@ -90,7 +90,7 @@ CREATE TABLE entity_has_right_entity (
     FOREIGN KEY (right_web_id, right_entity_uuid) REFERENCES entity_ids
 );
 CREATE INDEX entity_has_right_entity_source_idx
-    ON entity_has_right_entity(web_id, entity_uuid);
+ON entity_has_right_entity (web_id, entity_uuid);
 
 CREATE TABLE entity_embeddings (
     web_id UUID NOT NULL,
diff --git a/libs/@local/graph/postgres-store/postgres_migrations/.sqlfluffignore b/libs/@local/graph/postgres-store/postgres_migrations/.sqlfluffignore
new file mode 100644
index 00000000000..72e8ffc0db8
--- /dev/null
+++ b/libs/@local/graph/postgres-store/postgres_migrations/.sqlfluffignore
@@ -0,0 +1 @@
+*