0.5.3

kb_lib/src/db.rs

@@ -15,30 +15,40 @@ mod types;
 
 pub use crate::db::connection::KbDatabase;
 pub use crate::db::connection::KbDatabaseConnection;
+pub use crate::db::dtos::KbAnalysisSignalDto;
 pub use crate::db::dtos::KbDbMetadataDto;
 pub use crate::db::dtos::KbDbRuntimeEventDto;
 pub use crate::db::dtos::KbKnownHttpEndpointDto;
 pub use crate::db::dtos::KbKnownWsEndpointDto;
 pub use crate::db::dtos::KbObservedTokenDto;
+pub use crate::db::dtos::KbOnchainObservationDto;
+pub use crate::db::entities::KbAnalysisSignalEntity;
 pub use crate::db::entities::KbDbMetadataEntity;
 pub use crate::db::entities::KbDbRuntimeEventEntity;
 pub use crate::db::entities::KbKnownHttpEndpointEntity;
 pub use crate::db::entities::KbKnownWsEndpointEntity;
 pub use crate::db::entities::KbObservedTokenEntity;
+pub use crate::db::entities::KbOnchainObservationEntity;
 pub use crate::db::queries::get_db_metadata;
 pub use crate::db::queries::get_known_http_endpoint;
 pub use crate::db::queries::get_known_ws_endpoint;
 pub use crate::db::queries::get_observed_token_by_mint;
+pub use crate::db::queries::insert_analysis_signal;
 pub use crate::db::queries::insert_db_runtime_event;
+pub use crate::db::queries::insert_onchain_observation;
 pub use crate::db::queries::list_db_metadata;
 pub use crate::db::queries::list_known_http_endpoints;
 pub use crate::db::queries::list_known_ws_endpoints;
 pub use crate::db::queries::list_observed_tokens;
+pub use crate::db::queries::list_recent_analysis_signals;
 pub use crate::db::queries::list_recent_db_runtime_events;
+pub use crate::db::queries::list_recent_onchain_observations;
 pub use crate::db::queries::upsert_db_metadata;
 pub use crate::db::queries::upsert_known_http_endpoint;
 pub use crate::db::queries::upsert_known_ws_endpoint;
 pub use crate::db::queries::upsert_observed_token;
+pub use crate::db::types::KbAnalysisSignalSeverity;
 pub use crate::db::types::KbDatabaseBackend;
 pub use crate::db::types::KbDbRuntimeEventLevel;
+pub use crate::db::types::KbObservationSourceKind;
 pub use crate::db::types::KbObservedTokenStatus;

kb_lib/src/db/dtos.rs

@@ -2,14 +2,18 @@
 
 //! Database data transfer objects.
 
+mod analysis_signal;
 mod db_metadata;
 mod db_runtime_event;
 mod known_http_endpoint;
 mod known_ws_endpoint;
 mod observed_token;
+mod onchain_observation;
 
+pub use crate::db::dtos::analysis_signal::KbAnalysisSignalDto;
 pub use crate::db::dtos::db_metadata::KbDbMetadataDto;
 pub use crate::db::dtos::db_runtime_event::KbDbRuntimeEventDto;
 pub use crate::db::dtos::known_http_endpoint::KbKnownHttpEndpointDto;
 pub use crate::db::dtos::known_ws_endpoint::KbKnownWsEndpointDto;
 pub use crate::db::dtos::observed_token::KbObservedTokenDto;
+pub use crate::db::dtos::onchain_observation::KbOnchainObservationDto;

kb_lib/src/db/dtos/analysis_signal.rs

@@ -0,0 +1,89 @@
+// file: kb_lib/src/db/dtos/analysis_signal.rs
+
+//! Analysis signal DTO.
+
+/// Application-facing analysis signal DTO.
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct KbAnalysisSignalDto {
+    /// Optional numeric primary key.
+    pub id: std::option::Option<i64>,
+    /// Signal kind.
+    pub signal_kind: std::string::String,
+    /// Signal severity.
+    pub severity: crate::KbAnalysisSignalSeverity,
+    /// Logical object key, for example a mint, signature or pool address.
+    pub object_key: std::string::String,
+    /// Optional related on-chain observation id.
+    pub related_observation_id: std::option::Option<i64>,
+    /// Optional numeric score.
+    pub score: std::option::Option<f64>,
+    /// Signal payload.
+    pub payload: serde_json::Value,
+    /// Creation timestamp.
+    pub created_at: chrono::DateTime<chrono::Utc>,
+}
+
+impl KbAnalysisSignalDto {
+    /// Creates a new analysis signal DTO with the current timestamp.
+    pub fn new(
+        signal_kind: std::string::String,
+        severity: crate::KbAnalysisSignalSeverity,
+        object_key: std::string::String,
+        related_observation_id: std::option::Option<i64>,
+        score: std::option::Option<f64>,
+        payload: serde_json::Value,
+    ) -> Self {
+        Self {
+            id: None,
+            signal_kind,
+            severity,
+            object_key,
+            related_observation_id,
+            score,
+            payload,
+            created_at: chrono::Utc::now(),
+        }
+    }
+}
+
+impl TryFrom<crate::KbAnalysisSignalEntity> for KbAnalysisSignalDto {
+    type Error = crate::KbError;
+
+    fn try_from(entity: crate::KbAnalysisSignalEntity) -> Result<Self, Self::Error> {
+        let severity_result = crate::KbAnalysisSignalSeverity::from_i16(entity.severity);
+        let severity = match severity_result {
+            Ok(severity) => severity,
+            Err(error) => return Err(error),
+        };
+        let created_at_result = chrono::DateTime::parse_from_rfc3339(&entity.created_at);
+        let created_at = match created_at_result {
+            Ok(created_at) => created_at.with_timezone(&chrono::Utc),
+            Err(error) => {
+                return Err(crate::KbError::Db(format!(
+                    "cannot parse analysis signal created_at '{}': {}",
+                    entity.created_at, error
+                )));
+            }
+        };
+        let payload_result = serde_json::from_str::<serde_json::Value>(&entity.payload_json);
+        let payload = match payload_result {
+            Ok(payload) => payload,
+            Err(error) => {
+                return Err(crate::KbError::Db(format!(
+                    "cannot parse analysis signal payload_json '{}': {}",
+                    entity.payload_json, error
+                )));
+            }
+        };
+        Ok(Self {
+            id: Some(entity.id),
+            signal_kind: entity.signal_kind,
+            severity,
+            object_key: entity.object_key,
+            related_observation_id: entity.related_observation_id,
+            score: entity.score,
+            payload,
+            created_at,
+        })
+    }
+}

kb_lib/src/db/dtos/onchain_observation.rs

@@ -0,0 +1,104 @@
+// file: kb_lib/src/db/dtos/onchain_observation.rs
+
+//! On-chain observation DTO.
+
+/// Application-facing on-chain observation DTO.
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct KbOnchainObservationDto {
+    /// Optional numeric primary key.
+    pub id: std::option::Option<i64>,
+    /// Observation kind.
+    pub observation_kind: std::string::String,
+    /// Observation source family.
+    pub source_kind: crate::KbObservationSourceKind,
+    /// Optional source endpoint logical name.
+    pub endpoint_name: std::option::Option<std::string::String>,
+    /// Logical object key, for example a mint, signature or pool address.
+    pub object_key: std::string::String,
+    /// Optional slot number.
+    pub slot: std::option::Option<u64>,
+    /// Raw JSON payload.
+    pub payload: serde_json::Value,
+    /// Observation timestamp.
+    pub observed_at: chrono::DateTime<chrono::Utc>,
+}
+
+impl KbOnchainObservationDto {
+    /// Creates a new on-chain observation DTO with the current timestamp.
+    pub fn new(
+        observation_kind: std::string::String,
+        source_kind: crate::KbObservationSourceKind,
+        endpoint_name: std::option::Option<std::string::String>,
+        object_key: std::string::String,
+        slot: std::option::Option<u64>,
+        payload: serde_json::Value,
+    ) -> Self {
+        Self {
+            id: None,
+            observation_kind,
+            source_kind,
+            endpoint_name,
+            object_key,
+            slot,
+            payload,
+            observed_at: chrono::Utc::now(),
+        }
+    }
+}
+
+impl TryFrom<crate::KbOnchainObservationEntity> for KbOnchainObservationDto {
+    type Error = crate::KbError;
+
+    fn try_from(entity: crate::KbOnchainObservationEntity) -> Result<Self, Self::Error> {
+        let source_kind_result = crate::KbObservationSourceKind::from_i16(entity.source_kind);
+        let source_kind = match source_kind_result {
+            Ok(source_kind) => source_kind,
+            Err(error) => return Err(error),
+        };
+        let observed_at_result = chrono::DateTime::parse_from_rfc3339(&entity.observed_at);
+        let observed_at = match observed_at_result {
+            Ok(observed_at) => observed_at.with_timezone(&chrono::Utc),
+            Err(error) => {
+                return Err(crate::KbError::Db(format!(
+                    "cannot parse on-chain observation observed_at '{}': {}",
+                    entity.observed_at, error
+                )));
+            }
+        };
+        let payload_result = serde_json::from_str::<serde_json::Value>(&entity.payload_json);
+        let payload = match payload_result {
+            Ok(payload) => payload,
+            Err(error) => {
+                return Err(crate::KbError::Db(format!(
+                    "cannot parse on-chain observation payload_json '{}': {}",
+                    entity.payload_json, error
+                )));
+            }
+        };
+        let slot = match entity.slot {
+            Some(slot) => {
+                let slot_result = u64::try_from(slot);
+                match slot_result {
+                    Ok(slot) => Some(slot),
+                    Err(error) => {
+                        return Err(crate::KbError::Db(format!(
+                            "cannot convert on-chain observation slot '{}' to u64: {}",
+                            slot, error
+                        )));
+                    }
+                }
+            }
+            None => None,
+        };
+        Ok(Self {
+            id: Some(entity.id),
+            observation_kind: entity.observation_kind,
+            source_kind,
+            endpoint_name: entity.endpoint_name,
+            object_key: entity.object_key,
+            slot,
+            payload,
+            observed_at,
+        })
+    }
+}

kb_lib/src/db/entities.rs

@@ -4,14 +4,18 @@
 //!
 //! These types are close to persisted rows and SQL query results.
 
+mod analysis_signal;
 mod db_metadata;
 mod db_runtime_event;
 mod known_http_endpoint;
 mod known_ws_endpoint;
 mod observed_token;
+mod onchain_observation;
 
+pub use crate::db::entities::analysis_signal::KbAnalysisSignalEntity;
 pub use crate::db::entities::db_metadata::KbDbMetadataEntity;
 pub use crate::db::entities::db_runtime_event::KbDbRuntimeEventEntity;
 pub use crate::db::entities::known_http_endpoint::KbKnownHttpEndpointEntity;
 pub use crate::db::entities::known_ws_endpoint::KbKnownWsEndpointEntity;
 pub use crate::db::entities::observed_token::KbObservedTokenEntity;
+pub use crate::db::entities::onchain_observation::KbOnchainObservationEntity;

kb_lib/src/db/entities/analysis_signal.rs

@@ -0,0 +1,24 @@
+// file: kb_lib/src/db/entities/analysis_signal.rs
+
+//! Analysis signal entity.
+
+/// Persisted analysis signal row.
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, sqlx::FromRow)]
+pub struct KbAnalysisSignalEntity {
+    /// Numeric primary key.
+    pub id: i64,
+    /// Signal kind.
+    pub signal_kind: std::string::String,
+    /// Signal severity stored as stable integer.
+    pub severity: i16,
+    /// Logical object key, for example a mint, signature or pool address.
+    pub object_key: std::string::String,
+    /// Optional related on-chain observation id.
+    pub related_observation_id: std::option::Option<i64>,
+    /// Optional numeric score.
+    pub score: std::option::Option<f64>,
+    /// JSON-encoded payload.
+    pub payload_json: std::string::String,
+    /// Creation timestamp encoded as RFC3339 UTC text.
+    pub created_at: std::string::String,
+}

kb_lib/src/db/entities/onchain_observation.rs

@@ -0,0 +1,24 @@
+// file: kb_lib/src/db/entities/onchain_observation.rs
+
+//! On-chain observation entity.
+
+/// Persisted on-chain observation row.
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, sqlx::FromRow)]
+pub struct KbOnchainObservationEntity {
+    /// Numeric primary key.
+    pub id: i64,
+    /// Observation kind.
+    pub observation_kind: std::string::String,
+    /// Observation source family stored as stable integer.
+    pub source_kind: i16,
+    /// Optional source endpoint logical name.
+    pub endpoint_name: std::option::Option<std::string::String>,
+    /// Logical object key, for example a mint, signature or pool address.
+    pub object_key: std::string::String,
+    /// Optional slot number.
+    pub slot: std::option::Option<i64>,
+    /// JSON-encoded raw payload.
+    pub payload_json: std::string::String,
+    /// Observation timestamp encoded as RFC3339 UTC text.
+    pub observed_at: std::string::String,
+}

kb_lib/src/db/queries.rs

@@ -2,12 +2,16 @@
 
 //! Database queries.
 
+mod analysis_signal;
 mod db_metadata;
 mod db_runtime_event;
 mod known_http_endpoint;
 mod known_ws_endpoint;
 mod observed_token;
+mod onchain_observation;
 
+pub use crate::db::queries::analysis_signal::insert_analysis_signal;
+pub use crate::db::queries::analysis_signal::list_recent_analysis_signals;
 pub use crate::db::queries::db_metadata::get_db_metadata;
 pub use crate::db::queries::db_metadata::list_db_metadata;
 pub use crate::db::queries::db_metadata::upsert_db_metadata;
@@ -22,3 +26,5 @@ pub use crate::db::queries::known_ws_endpoint::upsert_known_ws_endpoint;
 pub use crate::db::queries::observed_token::get_observed_token_by_mint;
 pub use crate::db::queries::observed_token::list_observed_tokens;
 pub use crate::db::queries::observed_token::upsert_observed_token;
+pub use crate::db::queries::onchain_observation::insert_onchain_observation;
+pub use crate::db::queries::onchain_observation::list_recent_onchain_observations;

kb_lib/src/db/queries/analysis_signal.rs

@@ -0,0 +1,154 @@
+// file: kb_lib/src/db/queries/analysis_signal.rs
+
+//! Queries for `kb_analysis_signals`.
+
+/// Inserts one analysis signal row and returns its numeric id.
+pub async fn insert_analysis_signal(
+    database: &crate::KbDatabase,
+    dto: &crate::KbAnalysisSignalDto,
+) -> Result<i64, crate::KbError> {
+    let payload_json_result = serde_json::to_string(&dto.payload);
+    let payload_json = match payload_json_result {
+        Ok(payload_json) => payload_json,
+        Err(error) => {
+            return Err(crate::KbError::Db(format!(
+                "cannot serialize analysis signal payload: {}",
+                error
+            )));
+        }
+    };
+    match database.connection() {
+        crate::KbDatabaseConnection::Sqlite(pool) => {
+            let query_result = sqlx::query(
+                r#"
+INSERT INTO kb_analysis_signals (
+    signal_kind,
+    severity,
+    object_key,
+    related_observation_id,
+    score,
+    payload_json,
+    created_at
+)
+VALUES (?, ?, ?, ?, ?, ?, ?)
+                "#,
+            )
+            .bind(dto.signal_kind.clone())
+            .bind(dto.severity.to_i16())
+            .bind(dto.object_key.clone())
+            .bind(dto.related_observation_id)
+            .bind(dto.score)
+            .bind(payload_json)
+            .bind(dto.created_at.to_rfc3339())
+            .execute(pool)
+            .await;
+            let query_result = match query_result {
+                Ok(query_result) => query_result,
+                Err(error) => {
+                    return Err(crate::KbError::Db(format!(
+                        "cannot insert kb_analysis_signals on sqlite: {}",
+                        error
+                    )));
+                }
+            };
+            Ok(query_result.last_insert_rowid())
+        }
+    }
+}
+
+/// Lists recent analysis signals ordered from newest to oldest.
+pub async fn list_recent_analysis_signals(
+    database: &crate::KbDatabase,
+    limit: u32,
+) -> Result<std::vec::Vec<crate::KbAnalysisSignalDto>, crate::KbError> {
+    if limit == 0 {
+        return Ok(std::vec::Vec::new());
+    }
+    match database.connection() {
+        crate::KbDatabaseConnection::Sqlite(pool) => {
+            let query_result = sqlx::query_as::<sqlx::Sqlite, crate::KbAnalysisSignalEntity>(
+                r#"
+SELECT
+    id,
+    signal_kind,
+    severity,
+    object_key,
+    related_observation_id,
+    score,
+    payload_json,
+    created_at
+FROM kb_analysis_signals
+ORDER BY id DESC
+LIMIT ?
+                    "#,
+            )
+            .bind(i64::from(limit))
+            .fetch_all(pool)
+            .await;
+            let entities = match query_result {
+                Ok(entities) => entities,
+                Err(error) => {
+                    return Err(crate::KbError::Db(format!(
+                        "cannot list analysis signals on sqlite: {}",
+                        error
+                    )));
+                }
+            };
+            let mut dtos = std::vec::Vec::new();
+            for entity in entities {
+                let dto_result = crate::KbAnalysisSignalDto::try_from(entity);
+                let dto = match dto_result {
+                    Ok(dto) => dto,
+                    Err(error) => return Err(error),
+                };
+                dtos.push(dto);
+            }
+            Ok(dtos)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[tokio::test]
+    async fn analysis_signal_roundtrip_works() {
+        let tempdir = tempfile::tempdir().expect("tempdir must succeed");
+        let database_path = tempdir.path().join("analysis_signal.sqlite3");
+        let config = crate::KbDatabaseConfig {
+            enabled: true,
+            backend: crate::KbDatabaseBackend::Sqlite,
+            sqlite: crate::KbSqliteDatabaseConfig {
+                path: database_path.to_string_lossy().to_string(),
+                create_if_missing: true,
+                busy_timeout_ms: 5000,
+                max_connections: 1,
+                auto_initialize_schema: true,
+                use_wal: true,
+            },
+        };
+        let database = crate::KbDatabase::connect_and_initialize(&config)
+            .await
+            .expect("database init must succeed");
+        let dto = crate::KbAnalysisSignalDto::new(
+            "candidate_token".to_string(),
+            crate::KbAnalysisSignalSeverity::Medium,
+            "So11111111111111111111111111111111111111112".to_string(),
+            None,
+            Some(0.72),
+            serde_json::json!({
+                "reason": "fresh_token_with_activity"
+            }),
+        );
+        let inserted_id = crate::insert_analysis_signal(&database, &dto)
+            .await
+            .expect("insert must succeed");
+        assert!(inserted_id > 0);
+        let listed = crate::list_recent_analysis_signals(&database, 10)
+            .await
+            .expect("list must succeed");
+        assert_eq!(listed.len(), 1);
+        assert_eq!(listed[0].signal_kind, "candidate_token");
+        assert_eq!(listed[0].severity, crate::KbAnalysisSignalSeverity::Medium);
+        assert_eq!(listed[0].score, Some(0.72));
+    }
+}

kb_lib/src/db/queries/onchain_observation.rs

@@ -0,0 +1,170 @@
+// file: kb_lib/src/db/queries/onchain_observation.rs
+
+//! Queries for `kb_onchain_observations`.
+
+/// Inserts one on-chain observation row and returns its numeric id.
+pub async fn insert_onchain_observation(
+    database: &crate::KbDatabase,
+    dto: &crate::KbOnchainObservationDto,
+) -> Result<i64, crate::KbError> {
+    let payload_json_result = serde_json::to_string(&dto.payload);
+    let payload_json = match payload_json_result {
+        Ok(payload_json) => payload_json,
+        Err(error) => {
+            return Err(crate::KbError::Db(format!(
+                "cannot serialize on-chain observation payload: {}",
+                error
+            )));
+        }
+    };
+    let slot_i64 = match dto.slot {
+        Some(slot) => {
+            let slot_result = i64::try_from(slot);
+            match slot_result {
+                Ok(slot) => Some(slot),
+                Err(error) => {
+                    return Err(crate::KbError::Db(format!(
+                        "cannot convert on-chain observation slot '{}' to i64: {}",
+                        slot, error
+                    )));
+                }
+            }
+        }
+        None => None,
+    };
+    match database.connection() {
+        crate::KbDatabaseConnection::Sqlite(pool) => {
+            let query_result = sqlx::query(
+                r#"
+INSERT INTO kb_onchain_observations (
+    observation_kind,
+    source_kind,
+    endpoint_name,
+    object_key,
+    slot,
+    payload_json,
+    observed_at
+)
+VALUES (?, ?, ?, ?, ?, ?, ?)
+                "#,
+            )
+            .bind(dto.observation_kind.clone())
+            .bind(dto.source_kind.to_i16())
+            .bind(dto.endpoint_name.clone())
+            .bind(dto.object_key.clone())
+            .bind(slot_i64)
+            .bind(payload_json)
+            .bind(dto.observed_at.to_rfc3339())
+            .execute(pool)
+            .await;
+            let query_result = match query_result {
+                Ok(query_result) => query_result,
+                Err(error) => {
+                    return Err(crate::KbError::Db(format!(
+                        "cannot insert kb_onchain_observations on sqlite: {}",
+                        error
+                    )));
+                }
+            };
+            Ok(query_result.last_insert_rowid())
+        }
+    }
+}
+
+/// Lists recent on-chain observations ordered from newest to oldest.
+pub async fn list_recent_onchain_observations(
+    database: &crate::KbDatabase,
+    limit: u32,
+) -> Result<std::vec::Vec<crate::KbOnchainObservationDto>, crate::KbError> {
+    if limit == 0 {
+        return Ok(std::vec::Vec::new());
+    }
+    match database.connection() {
+        crate::KbDatabaseConnection::Sqlite(pool) => {
+            let query_result = sqlx::query_as::<sqlx::Sqlite, crate::KbOnchainObservationEntity>(
+                r#"
+SELECT
+    id,
+    observation_kind,
+    source_kind,
+    endpoint_name,
+    object_key,
+    slot,
+    payload_json,
+    observed_at
+FROM kb_onchain_observations
+ORDER BY id DESC
+LIMIT ?
+                    "#,
+            )
+            .bind(i64::from(limit))
+            .fetch_all(pool)
+            .await;
+            let entities = match query_result {
+                Ok(entities) => entities,
+                Err(error) => {
+                    return Err(crate::KbError::Db(format!(
+                        "cannot list on-chain observations on sqlite: {}",
+                        error
+                    )));
+                }
+            };
+            let mut dtos = std::vec::Vec::new();
+            for entity in entities {
+                let dto_result = crate::KbOnchainObservationDto::try_from(entity);
+                let dto = match dto_result {
+                    Ok(dto) => dto,
+                    Err(error) => return Err(error),
+                };
+                dtos.push(dto);
+            }
+            Ok(dtos)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[tokio::test]
+    async fn onchain_observation_roundtrip_works() {
+        let tempdir = tempfile::tempdir().expect("tempdir must succeed");
+        let database_path = tempdir.path().join("onchain_observation.sqlite3");
+        let config = crate::KbDatabaseConfig {
+            enabled: true,
+            backend: crate::KbDatabaseBackend::Sqlite,
+            sqlite: crate::KbSqliteDatabaseConfig {
+                path: database_path.to_string_lossy().to_string(),
+                create_if_missing: true,
+                busy_timeout_ms: 5000,
+                max_connections: 1,
+                auto_initialize_schema: true,
+                use_wal: true,
+            },
+        };
+        let database = crate::KbDatabase::connect_and_initialize(&config)
+            .await
+            .expect("database init must succeed");
+        let dto = crate::KbOnchainObservationDto::new(
+            "token_discovered".to_string(),
+            crate::KbObservationSourceKind::WsRpc,
+            Some("mainnet_public_ws_slots".to_string()),
+            "So11111111111111111111111111111111111111112".to_string(),
+            Some(123456u64),
+            serde_json::json!({
+                "mint": "So11111111111111111111111111111111111111112",
+                "source": "ws"
+            }),
+        );
+        let inserted_id = crate::insert_onchain_observation(&database, &dto)
+            .await
+            .expect("insert must succeed");
+        assert!(inserted_id > 0);
+        let listed = crate::list_recent_onchain_observations(&database, 10)
+            .await
+            .expect("list must succeed");
+        assert_eq!(listed.len(), 1);
+        assert_eq!(listed[0].observation_kind, "token_discovered");
+        assert_eq!(listed[0].source_kind, crate::KbObservationSourceKind::WsRpc);
+        assert_eq!(listed[0].slot, Some(123456u64));
+    }
+}

kb_lib/src/db/schema.rs

@@ -3,9 +3,7 @@
 //! Database schema initialization.
 
 /// Ensures that the database schema exists.
-pub(crate) async fn ensure_schema(
-    database: &crate::KbDatabase,
-) -> Result<(), crate::KbError> {
+pub(crate) async fn ensure_schema(database: &crate::KbDatabase) -> Result<(), crate::KbError> {
     match database.connection() {
         crate::KbDatabaseConnection::Sqlite(pool) => {
             let metadata_table_result = sqlx::query(
@@ -153,6 +151,107 @@ ON kb_observed_tokens (status)
                     error
                 )));
             }
+            let onchain_observations_result = sqlx::query(
+                r#"
+CREATE TABLE IF NOT EXISTS kb_onchain_observations (
+    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    observation_kind TEXT NOT NULL,
+    source_kind INTEGER NOT NULL,
+    endpoint_name TEXT NULL,
+    object_key TEXT NOT NULL,
+    slot INTEGER NULL,
+    payload_json TEXT NOT NULL,
+    observed_at TEXT NOT NULL
+)
+                "#,
+            )
+            .execute(pool)
+            .await;
+            if let Err(error) = onchain_observations_result {
+                return Err(crate::KbError::Db(format!(
+                    "cannot create table kb_onchain_observations on sqlite: {}",
+                    error
+                )));
+            }
+            let onchain_observations_object_key_index_result = sqlx::query(
+                r#"
+CREATE INDEX IF NOT EXISTS kb_idx_onchain_observations_object_key
+ON kb_onchain_observations (object_key)
+                "#,
+            )
+            .execute(pool)
+            .await;
+            if let Err(error) = onchain_observations_object_key_index_result {
+                return Err(crate::KbError::Db(format!(
+                    "cannot create index kb_idx_onchain_observations_object_key on sqlite: {}",
+                    error
+                )));
+            }
+            let onchain_observations_observed_at_index_result = sqlx::query(
+                r#"
+CREATE INDEX IF NOT EXISTS kb_idx_onchain_observations_observed_at
+ON kb_onchain_observations (observed_at)
+                "#,
+            )
+            .execute(pool)
+            .await;
+            if let Err(error) = onchain_observations_observed_at_index_result {
+                return Err(crate::KbError::Db(format!(
+                    "cannot create index kb_idx_onchain_observations_observed_at on sqlite: {}",
+                    error
+                )));
+            }
+            let analysis_signals_result = sqlx::query(
+                r#"
+CREATE TABLE IF NOT EXISTS kb_analysis_signals (
+    id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    signal_kind TEXT NOT NULL,
+    severity INTEGER NOT NULL,
+    object_key TEXT NOT NULL,
+    related_observation_id INTEGER NULL,
+    score REAL NULL,
+    payload_json TEXT NOT NULL,
+    created_at TEXT NOT NULL,
+    FOREIGN KEY(related_observation_id) REFERENCES kb_onchain_observations(id)
+)
+                "#,
+            )
+            .execute(pool)
+            .await;
+            if let Err(error) = analysis_signals_result {
+                return Err(crate::KbError::Db(format!(
+                    "cannot create table kb_analysis_signals on sqlite: {}",
+                    error
+                )));
+            }
+            let analysis_signals_object_key_index_result = sqlx::query(
+                r#"
+CREATE INDEX IF NOT EXISTS kb_idx_analysis_signals_object_key
+ON kb_analysis_signals (object_key)
+                "#,
+            )
+            .execute(pool)
+            .await;
+            if let Err(error) = analysis_signals_object_key_index_result {
+                return Err(crate::KbError::Db(format!(
+                    "cannot create index kb_idx_analysis_signals_object_key on sqlite: {}",
+                    error
+                )));
+            }
+            let analysis_signals_created_at_index_result = sqlx::query(
+                r#"
+CREATE INDEX IF NOT EXISTS kb_idx_analysis_signals_created_at
+ON kb_analysis_signals (created_at)
+                "#,
+            )
+            .execute(pool)
+            .await;
+            if let Err(error) = analysis_signals_created_at_index_result {
+                return Err(crate::KbError::Db(format!(
+                    "cannot create index kb_idx_analysis_signals_created_at on sqlite: {}",
+                    error
+                )));
+            }
             let schema_version = crate::KbDbMetadataDto::new(
                 "schema_version".to_string(),
                 env!("CARGO_PKG_VERSION").to_string(),
@@ -162,6 +261,6 @@ ON kb_observed_tokens (status)
                 return Err(error);
             }
             Ok(())
-        },
+        }
     }
 }

kb_lib/src/db/types.rs

@@ -2,10 +2,14 @@
 
 //! Database shared types.
 
+mod analysis_signal_severity;
 mod database_backend;
+mod observation_source_kind;
 mod observed_token_status;
 mod runtime_event_level;
 
+pub use crate::db::types::analysis_signal_severity::KbAnalysisSignalSeverity;
 pub use crate::db::types::database_backend::KbDatabaseBackend;
+pub use crate::db::types::observation_source_kind::KbObservationSourceKind;
 pub use crate::db::types::observed_token_status::KbObservedTokenStatus;
 pub use crate::db::types::runtime_event_level::KbDbRuntimeEventLevel;

kb_lib/src/db/types/analysis_signal_severity.rs

@@ -0,0 +1,48 @@
+// file: kb_lib/src/db/types/analysis_signal_severity.rs
+
+//! Analysis signal severity.
+
+/// Severity for one analysis signal.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+pub enum KbAnalysisSignalSeverity {
+    /// Informational signal.
+    Info,
+    /// Low-importance signal.
+    Low,
+    /// Medium-importance signal.
+    Medium,
+    /// High-importance signal.
+    High,
+    /// Critical signal.
+    Critical,
+}
+
+impl KbAnalysisSignalSeverity {
+    /// Converts the severity to its stable integer representation.
+    pub fn to_i16(self) -> i16 {
+        match self {
+            Self::Info => 0,
+            Self::Low => 1,
+            Self::Medium => 2,
+            Self::High => 3,
+            Self::Critical => 4,
+        }
+    }
+
+    /// Restores a severity from its stable integer representation.
+    pub fn from_i16(
+        value: i16,
+    ) -> Result<Self, crate::KbError> {
+        match value {
+            0 => Ok(Self::Info),
+            1 => Ok(Self::Low),
+            2 => Ok(Self::Medium),
+            3 => Ok(Self::High),
+            4 => Ok(Self::Critical),
+            _ => Err(crate::KbError::Db(format!(
+                "invalid KbAnalysisSignalSeverity value: {}",
+                value
+            ))),
+        }
+    }
+}

kb_lib/src/db/types/observation_source_kind.rs

@@ -0,0 +1,46 @@
+// file: kb_lib/src/db/types/observation_source_kind.rs
+
+//! Observation source kind.
+
+/// Source family for one on-chain observation.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+pub enum KbObservationSourceKind {
+    /// HTTP RPC source.
+    HttpRpc,
+    /// WebSocket RPC source.
+    WsRpc,
+    /// Yellowstone gRPC source.
+    Grpc,
+    /// DEX connector source.
+    Dex,
+    /// Other source kind.
+    Other,
+}
+
+impl KbObservationSourceKind {
+    /// Converts the source kind to its stable integer representation.
+    pub fn to_i16(self) -> i16 {
+        match self {
+            Self::HttpRpc => 0,
+            Self::WsRpc => 1,
+            Self::Grpc => 2,
+            Self::Dex => 3,
+            Self::Other => 4,
+        }
+    }
+
+    /// Restores a source kind from its stable integer representation.
+    pub fn from_i16(value: i16) -> Result<Self, crate::KbError> {
+        match value {
+            0 => Ok(Self::HttpRpc),
+            1 => Ok(Self::WsRpc),
+            2 => Ok(Self::Grpc),
+            3 => Ok(Self::Dex),
+            4 => Ok(Self::Other),
+            _ => Err(crate::KbError::Db(format!(
+                "invalid KbObservationSourceKind value: {}",
+                value
+            ))),
+        }
+    }
+}

kb_lib/src/lib.rs

@@ -81,6 +81,16 @@ pub use crate::db::KbKnownWsEndpointEntity;
 pub use crate::db::KbObservedTokenDto;
 pub use crate::db::KbObservedTokenEntity;
 pub use crate::db::KbObservedTokenStatus;
+pub use crate::db::KbAnalysisSignalDto;
+pub use crate::db::KbAnalysisSignalEntity;
+pub use crate::db::KbAnalysisSignalSeverity;
+pub use crate::db::KbObservationSourceKind;
+pub use crate::db::KbOnchainObservationDto;
+pub use crate::db::KbOnchainObservationEntity;
+pub use crate::db::insert_analysis_signal;
+pub use crate::db::insert_onchain_observation;
+pub use crate::db::list_recent_analysis_signals;
+pub use crate::db::list_recent_onchain_observations;
 pub use crate::db::get_observed_token_by_mint;
 pub use crate::db::list_observed_tokens;
 pub use crate::db::upsert_observed_token;