.

migrations/20250510182916_file.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS "file"
+(
+    "id"           UUID    NOT NULL PRIMARY KEY DEFAULT uuid_generate_v7(),
+    "filename"     VARCHAR NOT NULL,
+    "content_type" VARCHAR NOT NULL,
+    "size"         INT8    NOT NULL
+);
+

migrations/20250510183101_uuidv7.down.sql

@@ -1 +0,0 @@
-DROP EXTENSION pg_uuidv7;

migrations/20250510183102_user.down.sql

@@ -1,4 +0,0 @@
-DROP TRIGGER trg_user_relation_update ON "user_relation";
-DROP FUNCTION fn_on_user_relation_update();
-DROP TABLE "user_relation";
-DROP TABLE "user";

migrations/20250510183102_user.sql

@@ -1,7 +1,7 @@
 CREATE TABLE IF NOT EXISTS "user"
 (
     "id"            UUID    NOT NULL PRIMARY KEY DEFAULT uuid_generate_v7(),
-    "avatar_url"    VARCHAR,
+    "avatar_id"     UUID    REFERENCES "file" ("id") ON DELETE SET NULL,
     "username"      VARCHAR NOT NULL UNIQUE,
     "display_name"  VARCHAR,
     "email"         VARCHAR NOT NULL,
@@ -25,6 +25,38 @@ CREATE TABLE IF NOT EXISTS "user_relation"
 INSERT INTO "user" ("username", "display_name", "email", "password_hash", "bot", "system")
 VALUES ('system', 'System', 'system@lionarius.ru', '', TRUE, TRUE);
 
+CREATE OR REPLACE FUNCTION check_avatar_is_image()
+    RETURNS TRIGGER AS
+$$
+DECLARE
+    file_content_type VARCHAR;
+BEGIN
+    -- Skip check if icon_id is null
+    IF NEW.avatar_id IS NULL THEN
+        RETURN NEW;
+    END IF;
+
+    -- Retrieve content_type from file table
+    SELECT content_type
+    INTO file_content_type
+    FROM file
+    WHERE id = NEW.avatar_id;
+
+    -- Raise exception if content_type does not start with 'image/'
+    IF file_content_type IS NULL OR file_content_type NOT LIKE 'image/%' THEN
+        RAISE EXCEPTION 'avatar_id must reference a file with content_type starting with image/';
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_check_icon_is_image
+    BEFORE INSERT OR UPDATE
+    ON "user"
+    FOR EACH ROW
+EXECUTE FUNCTION check_avatar_is_image();
+
 CREATE OR REPLACE FUNCTION fn_on_user_relation_update()
     RETURNS TRIGGER
     LANGUAGE plpgsql

migrations/20250510183125_server.down.sql

@@ -1 +0,0 @@
-DROP TABLE "server";

migrations/20250510183125_server.sql

@@ -3,7 +3,7 @@ CREATE TABLE IF NOT EXISTS "server"
     "id"       UUID    NOT NULL PRIMARY KEY DEFAULT uuid_generate_v7(),
     "owner_id" UUID    NOT NULL REFERENCES "user" ("id"),
     "name"     VARCHAR NOT NULL,
-    "icon_url" VARCHAR
+    "icon_id"  UUID    REFERENCES "file" ("id") ON DELETE SET NULL
 );
 
 CREATE TABLE IF NOT EXISTS "server_role"
@@ -42,6 +42,38 @@ CREATE TABLE IF NOT EXISTS "server_invite"
     "expires_at" TIMESTAMPTZ
 );
 
+CREATE OR REPLACE FUNCTION check_icon_is_image()
+    RETURNS TRIGGER AS
+$$
+DECLARE
+    file_content_type VARCHAR;
+BEGIN
+    -- Skip check if icon_id is null
+    IF NEW.icon_id IS NULL THEN
+        RETURN NEW;
+    END IF;
+
+    -- Retrieve content_type from file table
+    SELECT content_type
+    INTO file_content_type
+    FROM file
+    WHERE id = NEW.icon_id;
+
+    -- Raise exception if content_type does not start with 'image/'
+    IF file_content_type IS NULL OR file_content_type NOT LIKE 'image/%' THEN
+        RAISE EXCEPTION 'icon_id must reference a file with content_type starting with image/';
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_check_icon_is_image
+    BEFORE INSERT OR UPDATE
+    ON "server"
+    FOR EACH ROW
+EXECUTE FUNCTION check_icon_is_image();
+
 CREATE OR REPLACE FUNCTION check_server_user_role_server_id()
     RETURNS TRIGGER AS
 $$

migrations/20250510184011_channel_message.down.sql

@@ -1,2 +0,0 @@
-DROP TABLE "message";
-DROP TABLE "channel";

migrations/20250510184011_channel_message.sql

@@ -20,11 +20,19 @@ CREATE TABLE IF NOT EXISTS "channel_recipient"
 CREATE TABLE IF NOT EXISTS "message"
 (
     "id"         UUID NOT NULL PRIMARY KEY DEFAULT uuid_generate_v7(),
-    "author_id"  UUID NOT NULL REFERENCES "user" ("id"),
-    "channel_id" UUID NOT NULL REFERENCES "channel" ("id"),
+    "author_id"  UUID NOT NULL REFERENCES "user" ("id") ON DELETE CASCADE,
+    "channel_id" UUID NOT NULL REFERENCES "channel" ("id") ON DELETE CASCADE,
     "content"    TEXT NOT NULL
 );
 
+CREATE TABLE IF NOT EXISTS "message_attachment"
+(
+    "message_id" UUID NOT NULL REFERENCES "message" ON DELETE CASCADE,
+    "file_id"    UUID NOT NULL REFERENCES "file" ON DELETE CASCADE,
+    "order"      INT2 NOT NULL,
+    PRIMARY KEY ("message_id", "file_id")
+);
+
 ALTER TABLE "channel"
     ADD COLUMN "last_message_id" UUID REFERENCES "message" ("id") ON DELETE SET NULL;
 

migrations/20250510184916_file.down.sql

@@ -1,2 +0,0 @@
-DROP TABLE "message_attachment";
-DROP TABLE "file";

migrations/20250510184916_file.up.sql

@@ -1,16 +0,0 @@
-CREATE TABLE IF NOT EXISTS "file"
-(
-    "id"           UUID    NOT NULL PRIMARY KEY DEFAULT uuid_generate_v7(),
-    "filename"     VARCHAR NOT NULL,
-    "content_type" VARCHAR NOT NULL,
-    "url"          VARCHAR NOT NULL,
-    "size"         INT8    NOT NULL
-);
-
-CREATE TABLE IF NOT EXISTS "message_attachment"
-(
-    "message_id"    UUID NOT NULL REFERENCES "message" ON DELETE CASCADE,
-    "attachment_id" UUID NOT NULL REFERENCES "file" ON DELETE CASCADE,
-    "order"         INT2 NOT NULL,
-    PRIMARY KEY ("message_id", "attachment_id")
-);

migrations/20250517190855_util.sql

@@ -0,0 +1,35 @@
+CREATE OR REPLACE FUNCTION get_users_that_can_see_user(target_user_id UUID)
+    RETURNS TABLE (user_id UUID) AS $$
+BEGIN
+    RETURN QUERY
+        -- Users directly related to the target user
+        SELECT ur.user_id
+        FROM user_relation ur
+        WHERE ur.other_id = target_user_id
+
+        UNION
+
+        -- Users where target user is related to them
+        SELECT ur.other_id AS user_id
+        FROM user_relation ur
+        WHERE ur.user_id = target_user_id
+
+        UNION
+
+        -- Users who share a server with the target user
+        SELECT sm.user_id
+        FROM server_member sm
+                 JOIN server_member sm2 ON sm.server_id = sm2.server_id
+        WHERE sm2.user_id = target_user_id
+          AND sm.user_id != target_user_id
+
+        UNION
+
+        -- Users who share a channel with the target user (DM or group)
+        SELECT cr.user_id
+        FROM channel_recipient cr
+                 JOIN channel_recipient cr2 ON cr.channel_id = cr2.channel_id
+        WHERE cr2.user_id = target_user_id
+          AND cr.user_id != target_user_id;
+END;
+$$ LANGUAGE plpgsql;